Hüsnü Köktürk

• 1v2-hearing-aid
  
• 2W-FM-telsiz
  
• 2.5W-FM-telsiz
  
• 3W-FM-telsiz
  
• 4jj8
  
• 500w 7034 lambalı vhf telsiz amplifikatörü
  
• 829 lambalı vacuum tube 400w VHF takoz amplifier
  
• active antenna
  
• aktif anten
  
• alici-link_1
• alici-link_2
• am transmitter verici devresi
  
• Bayram hakkında bilgi-holiday
  
• Bebek ağlama sesi telsiz verici cihazI
  
• bebek alarm cihazI
  
• Bir transistörlü varyabl frekans tracking blinking yanar söner vfo osilator
  
• Blinking vfo oscillator
  
• Coilless-if-amplifier. Bobinsiz 455kc if veya mf rf amplifikator.
  
• crystal fm set kristal fm alıcı
  
• diinl işitme cihazları
  
• elektronik-org mini organ orgel
  
• fm-tel_1
  
• fm-tel_2
  
• fm-telsiz_1
  
• fm-telsiz_2
  
• frekansmetre
  
• Gerçekleri itiraf edebilme marifeti
  
• Hüsnü Köktürk TEST DEVRELERi
  
• Hüsnü Köktürk's hobby receivers
  
• Hüsnü Köktürk's hobby projects and links
  
• Hüsnü Köktürk's hobby hearing-aid, işitme cihazı projects and links
  
• Hüsnü Köktürk's hobby tesla projects and links
  
• Hüsnü-Köktürk fotoğraf denemeleri
  
• Hüsnü Köktürk's seçme yemek siteleri and links
  
• insanın kainattaki yeri
  
• ilginc
  
• klavye piyano
  
• Kristalli crystal fm alıcı receiver
  
• Küresel ısınma şemsiyesi
  
• LAMBALI 27-50 MHz VHF power RF amplifikator. tube 829 400w
  
  
• laser circuits LAZER DEVRELERİ
  
• Loop antenna receiver
  
• Manyetik loop anten-magnetic loop antenna
  
• Manyetik loop antenler-magnetic loop antennas
  
• mikrofon yerine hoparlor speaker as a mike
  
• Moduleli-rf-osilator.htm
  
• No cell mosfet portable radio pilsiz mosfetli portatif alıcı
  
• No voltage drop SSB transmitter power supply
  
• One transistor coilless if amplifier
  
• One transistor bip bip tracking xtal oscillator
  
• One transistor bip bip tracking xtal oscillator2
  
• ORMANI NASIL TANIYORUZ Türkiye/Yozgat
  
• Ormanı Nasıl Tanıyoruz Tanımadığımız Orman
  
• Perfect direct receiver
  
• Pilli piyano
• POWER TESLA Hüsnü Köktürk, Yüksek volt ve yüksek amper tesla
• receiver1
• receiver2
• receiver3
  
• receiver4
  
• receiver5
  
• receiver6
  
• receiver7
  
• receiver8
  
• receiver9
  
• receiver10
  
• Receiver11
  
• receiver12 gelişmiş TRF alıcı
• receiver13 gelişmiş TRF alıcı
• receiver14 VHF UHF TV receiver
• rf field strenght meter- saha güç ölçer
• Rf-mixer el yapısı homemade fm tuner
• RFG455 homemade 26-30MHz linear amplifikator, takoz, output stage
• REGEN ALICI AYARLARI Türkiye/Yozgat
  
• regenalicilinkleri.htm
  
• Seçme Yemek Siteleri
  
• Silinemeyen OCX gibi dosyaların silinmesi
  
• sinus music
  
• SSB transmitter power suppli
  
• TA6CAA
  
• TBA120
  
• TESLA hüsnü köktürk
  
• Tels1                  Tels2               Tels3  
  
• Telsiz1.htm         Telsiz2.htm           Telsiz3.htm   
•  Telsiz-transmitter-takoz-sen
  
• Transistorlu org
  
• Transistorlu org, mini orgel
  
• Verici Telsiz transmitter takoz sender
  
• yanmaz köryük no burn dummy
  
• Yozgatlı Fenni Baba ve tasavvufi şiiri
  
• Yozgatlı Huzni Baba ve basına yansımamış şiiri
  
• Zener test devreleri
  

  Audio power amplifier schematics

• 100W Amplifier
   
• 18W Audio amplifier
   
• 25W MOSFET amplifier
   
• Headphone amplifier
   
• Portable headphone amplifier
   
• 2W amplifier
   
• 4W amplifier
   
• 8 watt audio amp
   
• 20W Amplifier
   
• 50W Amplifier
   
• Amplified ear
  href="http://www.citycom.gr/electronics/projects/100Wampl/100wampl_engl.htm">100W Audio amplifier
   
• 100W RMS Amplifier
  Power Amplifier
   
• 300W Subwoofer Power Amplifier
   
• 20 Watt / Channel Stereo Power Amplifier
   

   

  Audio preamp circuits

• mu-stage microphone preamp
   
• Solid state microphone preamp
   
• Phono preamp
   
• Low impedance microphone amplifier
   
• Masthead preamp
   
• Preamplifier for microphone or guitar use
   
• Microphone amplifier
   
• RIAA phono amplifier
   
• Simple microphone preamplifier
   
• Tube microphone preamp
   
• Simple Stereo Electret Microphone Preamplifier
   
• Simple Stereo Electret Microphone Preamplifier
   
• Phono Preamp
   
• Simple microphone preamplifier
   
• ECM Mic preamp
   
• Hi Fi preamp
   
• Balanced microphone preamp
   
• Audio preamp
   
• Electret mic amplifier
   
• Audio preamplifier
   
• Vacuum Tube Microphone Preamp
   
• FET Preamp Cable
   
• Audio preamp
   
• Low impedance microphone amplifier
   
• Hi-Fi Preamplifier
   
• Crown IC-150A Preamplifier (PDF)
   

  Data acquisition and data logging schematics

• AD converter with tracking / sample-hold
   
• Analog to digital converter with switching preamplifier
   
• Simple flash A/D converter
   
• Low-cost A/D converter
   
• Logarithmic A/D encoder
   
• Wireless weater station
   

  Filter schematics

• Voltage Controlled State Variable Filter
   
• Galaxy Noise Filter
   
• RC Notch filter
   
• Low-pass active filter
   
• Filter Circuit for the Earthworm Seismic Data Acquisition System
   
• Active bandpass filters
   
• Bandpass filters
   
• Narrow band audio bandpass filter
   
• Single-Supply Sallen Key Notch Filter
   
• Single-Supply Twin T Butterworth Low Pass Filter
   
• Inversal notch and bandpass filter
   
• DC Accurate, Active RC Lowpass Filter
   
• Voltage controlled filter and oscillator
   
• 29.85 MHZ notch filter schematic
   
• LC
• Quiz Master
   
• GameBoy Schematic
   
• GameBoy LCD schematic
   
• GameBoy Power & Cartridge schematic
   
• GameBoy ROM+RAM+MBC1 Cart Schematic
   
• GameBoy MBC1 circuit equivalent
   
• Super GameBoy schematic
   
• Quiz show indicator
   
• Dreamcast interface
   
• Bingo!!! (on your tv)
  ZIP)
   
• PacLand Arcade Game (316k ZIP)
   
• Pengo Arcade Game (313k ZIP)
   
• Q*Bert Arcade Game (600k ZIP)
   
• Qix Arcade Game (476k ZIP)
   
• Scramble Arcade Game (600k ZIP)
   
• Time Pilot'84 Arcade Game (870k ZIP)
   
• Xevious Arcade Game (450k ZIP)
   
• Magic Wand Conjuring Trick
   
• Quiz game circuit
   
• E.S.P. Conjuring Trick
   
• Applause meter
   

• Infrared based schematics

• IR detector
   
• USB to infrared adapter
   
• Infrared transmitter for locomotives
   
• IR remote control system for PC
   
• IR Receiver (Amplitude Modulated IR)
   
• IR Transmitter for Audio (Amplitude Modulated IR)
   
• Infrared gate for door
   
• Infrared circuits for remote control
   
• Serial port controller infrared transmitter (PIC16F628)
   
• Digibox interface
   
• IR remote control
   
• IR remote control jammer
   
• Long Range Infrared Remote
   
• LCD + IR circuit schematic
   
• iRDA to TTL interface
   
• 40KHz light receiver (PDF)
   
• 40KHz TV-VCR repeater (PDF)
   
• Micro based PIR to IR remote converter
   
• Infrared remote transponder
   
• Build an Infrared night scope
   
• Decoding IR Remote Controls
   
• IR detector
   
• PC IR Remote Control
   
• An Ambient-Light-Ignoring Infrared Active Motion Detector
   
• Infrared Transmitter and Receiver schematic diagrams
   
• Pyroelectric Infrared Sensor
   
• Simple IR transmitter circuit
   
• Simple infra-red detector
   
• Infra Red Switch
   
• IR remote control extender
   
• IR Remote Control Extender Circuit (Mark 2)
   
• IR Remote Control Extender Circuit (Mark 3)
   
• IR Link
   
• IR remote control tester
   
• Infrared repeater
   
• 40khz IR Tester
   
• 555 timer 40khz IR Oscillator
   
• IR detector / emitter
   
• Fire-Stick infrared remote control
   
• Simple infrared remote control
   
• Infrared / Ultrasonic beacon
   
• Infrared transmitter / decoder
   
• Infrared logic probe
   
• Implementing Infrared Object Detection
   
• Infrared gate detector
   
• Infrared relay with relay output
   
• IR detector for robotics
  
  
   

   

  Laser related power supplies and data transmission

• Laser power supply
   
• Laser transmitter/receiver
   
• Laser harp
   
• Simple laser communicator
   
• LASER listening device
   
• LASER transmitter / receiver
   
• RS-232 Laser Transciever
   
• HeNe laser power supply schematics
   
• Light beam receiver for laser pistols
   
• 12V supply for He-Ne laser
   
• Laser diode transmitter
   
• Laser Telephone Receiver Circuit
   
• Fiber Optic Voice Communications
   
• Efficient Laser Supply
   
• 20MHz VCSEL 3mW laser test circuit (PDF)
   
• 10MHz to 20MHz laser light detector (PDF)
   
• Micro-power 40KHz burst laser diode driver (PDF)
   
• 40KHz laser burst detector (PDF)
   
• Modulated laser diode tester (PDF)
   
• Ar/Kr Ion Laser Power Supply
   
• Laser diode power supply circuits
   
• HeNe laser power supply
   
• OPT201 Laser receiver
   
• OPT301 Laser receiver
   
• Laser transmitter schematics
   
• Diode Laser Power Supplies
   
• Laser bug circuit
   
• RS-232 Laser Transceiver
   
• Experimental laser data link
   
• Diode Laser Power Supplies
   
• Ar/Kr Ion Laser Power Supply Design
   
• Laser light show
   
• Laser light show pattern generator
   
• Simple laser communicator
  
  
  
   

   

  LED related schematics

• Variety of LED circuits
   
• Winking LEDs
   
• LED flashing light
   
• LED initials
   
• LM3909 replacement using discrete components
   
• Color fade
   
• 1.5 Volt LED Flashers
   
• AC Line Powered LEDs
   
• Astable Multivibrator
   
• 9 Second Digital Readout Timer
   
• 9 Second LED Relay Timer
   
• 16 Stage Bi-Directional LED Sequencer, other sequencer and flaser circuits
   
• 10 Stage LED Sequencer
   
• 28 LED Clock Timer
   
• Fading Red Eyes
   
• Two Transistor LED Flasher
   
• 16 Stage Bi-Directional LED Sequencer
   
• Expandable 16 Stage LED Sequencer
   
• LED Photo Sensor Circuit
   
• LED chaser
   
• 7 Segment LED Counter
   
• 7 by 10 LED Moving Sign ( 27C512 EPROM)
   
• LED Flasher
   
• LED pulser with audible output
   
• IR Illuminator
   
• Flashing Christmas LED display
   
• ICL7660 LED flasher
   
• Sequencial LED Flasher with Reversable Direction
   
• Tri Color LED Controller with Serial Interface
   
• 1.5V LED flasher B (PDF)
   
• Low current LED flasher (PDF)
   
• 1.5V LED flasher A (PDF)
   
• Flashing LED advertising badge (PDF)
   
• Flashing LED advertising badge (PDF)
   
• Pulsed LED test circuit (PDF)
   
• Low battery voltage flasher (PDF)
   
• Adjustable flashing LED
   
• PWM white LED drivers
   
• Heart of LEDs
   
• Christmas Star
   
• Christmas tree
   
• LED Counter
   
• PIC16F84 LED chaser
   
• PIC16F84 LED signboard
   
• PIC16F84 LED signboard 2
   
• White LED circuits
   
• Assorted LED circuits
   
• LED Mood Light
   
• LED Audio VU Meter
   
• Scrolling LED sign
   
• LM3909 LED flasher
   
• Animated LED signboard (PIC16C84)
   
• Picxie 2 - 8x8 Animated LED Signboard
   

  Lighting schematics

• Garden light switch
   
• DMX lighting and special effects
   
• Microcontroller Multichannel Light Dimmer
   
• Disco style Strobe Light
   
• Varying Brightness AC Lamp
   
• 12 Volt Lamp Dimmer
   
• 120VAC Lamp Chaser Using Solid State Relays
   
• Flashing Neons (NE-51 / NE-2)
   
• Sequencing Neons (NE-51 / NE-2)
   
• Touch Activated Lamp
   
• 220V Flashing lights
   
• Coutesy lamp
   
• Bedside lamp timer
   
• TRIAC light dimmer
   
• 12VDC Fluorescent Lamp Driver
   
• Strobe light
   
• Adjustable Strobe Light
   
• RHINO8 EL Sequencer
   
• Smart 12V light dimmer (PDF)
   
• Light Sequenced Candelabra
   
• Light timer
   
• 5W Fluorescent light intensity modulator (PDF)
   
• 1W Fluorescent lamp night light (PDF)
   
• Low-voltage light dimmer
   
• Light chaser
   
• 4-channel dimmer rack
   
• PIC16F873 light controller
   
• Disco light controller
   
• Neon desklamp
   
• Electronic night light
   
• Neon lamp dimmer
   
• 10-channel follower for Austin Hotel
   
• 12V Color organ and reverb unit
   
• 8-bit digital firing circuit
   
• Audio trigger circuit for light chasers
   
• Christmas star
   
• Electronic candle
   
• Electronic candle V2
   
• Fluorescent light dimmer
   
• Strobe light
   
• LED Mood Light
   
• LX-800 Lighting system
   
• Xenon Strobe Light
   
• Lamp flasher/dimmer
   
• Efficient dc lamp dimmer - 74C14
   
• Instrument panel lamp dimmer control
  
  
  
   

   

  Medical and health related schematics

• Snore alarm electronic device
   
• EKG/EEG circuit
   
• Radiation Dosage-Rate Meter
   
• Heartbeat monitor
   
• Cranial Electrotherapy Stimulator
   
• Automated crib lights
   
• Jogging timer
   
• Tan timer
   
• Muscular Bio-stimulator
   
• Pedometer
   
• Heart rate monitor
   
• ECG amplifier
   
• Simple lie detector
   
• Simple lie detector
   
• Heartbeat transducer
   
• ECG Amplifier
   
• EEG preamp, anti alias filter and isolation circuit
   
• Self Contained Electromyograph (EMG)
   
• Cardiac monitor
   
• Galvanic Skin Response (GSR) Schematic
   
• Brain-Wave Machine
   
• Lie detector
   
• Simple lie detector
   
• ECG project page
   
• PC-based biofeedback monitor
   
• Pain field generator
   
• The ESP SIM (Sound Impairment Monitor)
   
• Respiration system
  
   

   

   

   

   

   

   

  
  
    AUDİO-2

  Low Frequency Sinewave Generators
   
• Horror movies sound effects
   
• Sound amplifier
   
• Temperature sensitive oscillator
   
• Twin-T Audio Sine Wave Oscillator
   
• 1.5V Audio Amplifier
   
• Low Power Op-Amp - Audio Amp (Intercom)
   
• 555 Tone Generator (8 Ohm Speaker)
   
• 3 Transistor Audio Amp (50 milliwatt)
   
• Low Frequency Sinewave Generator
   
• Audio level indicator
   
• Room noise detector
   
• Amplifier timer
   
• Bell ring generator
   
• Amplified ear
   
• Precision audio millivoltmeter
   
• Six-channel Mixer and Amplifier
   
• Audio Signal Source
   
• Analog VU meter
   
• Voltage controlled amplifier
   
• Audio graphic equaliser
   
• Intercom preamp
   
• FET audio mixer
   
• Microphone mixer
   
• Tone control
   
• Digital volume control
   
• Sound level meter
   
• CMOS IC audio oscillator
   
• Ultrasound detector
   
• Electronic siren
   
• Two-tone siren
   
• Underwater microphone
   
• Code practice oscillator
   
• Noise generator
   
• Electronic whistle
   
• Three band Active Tone Control
   
• Automatic gain control (AGC) circuits
   
• Audio frequency meter
   
• Bull Horn
   
• Sound Mixer/Amplifier
   
• Very loud beeper (PDF)
   
• Digital noise generator (PDF)
   
• Tone display system
   
• Tube amplifier
   
• Condenser microphone hookup
   
• Phase shifter
   
• Paradoxical Sound Syntheizer
   
• Various tube crossover circuits
   
• Bias circuits
   
• Audio line isolator
   
• Dynamic microphone to electret microphone input
   
• Line level signal to microphone input adapter
   
• Simple two line output combiner
   
• Electret microphone powering circuits
   
• Use amplifier phono input as line level input
   
• Speaker signals to line level inputs
   
• Spring reverb unit
   
• Sine wave generator
   
• Simple amplifier
   
• 3-Band equalizer
   
• 6-Input mixer
   
• Doorphone intercom
   
• Stereo line driver
   
• Audio notch filer
   
• Peak reading audio level meter
   
• Tone control
   
• Speaker Microphone Circuit
   
• Electronic canary
   
• Electronic siren
   
• Microphone phantom power supply
   
• NHT subwoofer amp
   
• Voltage Controlled Mixer w/Modulator
   
• Dual Voltage Controlled Oscillator w/Modulator
   
• Dual Voltage Controlled Filter w/Modulator
   
• Stereo Ducker
   
• MS Stereo Decoder
   
• MS Stereo Microphone
   
• RIAA Equalized Stereo Phono Preamp
   
• Tube active crossover
   
• Improved PL tone decoder
   
• Magnetic cartridge amplifier
   
• LM358 preamp
   
• Sound detector
   
• Tone detector
   
• Tone generator
   
• Warbler
   
• Fender Champ Replica
   
• Keyboard scanned 8-tone generator
   
• Audio test station
   
• Audio tone VU meter
   
• Pink noise generator
   
• Voltage Controlled Panner
   
• Low Noise Microphone Preamplifier
   
• Bridging Adapter For Power Amplifiers
   
• Simple Surround Sound Decoder
   
• Simplest Ever Amplifier Bridging
   
• Stereo Width Controllers
   
• Power Amplifier Clipping Indicator
   
• Phono Preamps For All
   
• Digital Delay Unit For Surround Sound
   
• Parametric And Sub-Woofer Equaliser
   
• High Quality Sound Mixer
   
• Loudspeaker Protection and Muting
   
• Direct Injection Box for Recording & PA Systems
   
• Minimalist Discrete Hi-Fi Preamp
   
• Signal Detecting Auto Power-On Unit
   
• Load Sensing Automatic Switch
   
• Amplifier thermal protection
   
• Active Sub-Woofer and Controller
   
• Balanced Line Driver & Receiver
   
• VU And PPM Audio Metering
   
• Variable Amplifier Impedance
   
• Linkwitz Cosine Burst Generator
   
• Low Noise Balanced Microphone Preamp
   
• Fast Audio Peak Limiter
   
• Subwoofer Equaliser
   
• 110 dB beeper - 74C14
   
• Audio output level meter
   
• Surround Sound Decoder Mk2
   
• Stereo compressor
   
• Audio mixer
  
  
  
   

   

  Miscellaneous schematics

• Orman Anlayışımız Orman Yağış Demektir
   
• TRF Regen Radyo Alici linkleri
   
• Ultrasonic radar
   
• How to generate a Rotating Field
   
• Chaos generator
   
• Simple BFO metal detector
   
• Voltage Comparator Information And Circuits
   
• Electromagnetic Levitator
   
• Build Your Own Digital Setting Circles For Your Astronomical Telescope
   
• PL tone generator (NE567)
   
• Bat detector
   
• Bat detector microphone pre-amplifiers
   
• DGPS receiver
   
• G Strain energy absorber
   
• RDS Encoder
   
• Toggle Switch Debounced Pushbutton
   
• RDS Encoder
   
• Discrete Set/Reset Flip Flop
   
• Monostable Flip Flops (one shot)
   
• Discrete Bistable Flip Flop
   
• Talking Morse Code Practice Computer
   
• Plant watering watcher
   
• Capacitance sensor
   
• Whistle responder
   
• Nocturnal animals whisker
   
• 12V DC electronic door chime
   
• Biasing Op-Amps into Class A
   
• Parasite zapper
   
• Full-duplex doorphone with 3 wires connection
   
• Analog computer
   
• BayComm packet modem
   
• Morse monitor
   
• HamComm modem interface
   
• Morse paddle keyer
   
• UV light box
   
• Voice activated tape recorder switch
   
• Random noise generator
   
• Analog pulse counter
   
• Analog opto-isolator
   
• Pulse width modulators (PWM)
   
• Pulse width to voltage converter
   
• Fantastic Atom Expander
   
• Black Light
   
• Computerize Your Room/Home
   
• Flash slave trigger
   
• A Visual CW Zero Beating Aid
   
• A two-way Morse practice set
   
• Magnetic levitation device
   
• Tesla power receiver
   
• Lazer Tag Equipment Modifications
   
• Garmin GPS data interconnect
   
• Inexpensive APRS Weather Station
   
• Walking robot
   
• Vibrating Pocket Bug Detector
   
• Basic op-amp circuits
   
• Electronic fish lure
   
• Ultrasonic sound receiver
   
• Experimental data transmitter for fiber optics
   
• Experimental fiber optic receiver
   
• Ion detector
   
• Darkness monitor
   
• Electroscope
   
• Simple event counter
   
• Geiger counter
   
• Light detector
   
• Short-circuit beeper
   
• LM 1800 FM stereo decoder
   
• Glitch detector
   
• MAX924 bar-graph level gauge
   
• Ultrasonic generator
   
• Negative ion generator
   
• ELF Monitor
   
• Power line FM intercom
   
• Intercom circuit
   
• Lightning Storm optical interrupter (PDF)
   
• Simple nitrogen spark generator (PDF)
   
• Ultrasonic transducer oscillator circuit
   
• Build logic gates using discrete parts
   
• Jacob's Ladder
   
• Sudden Ionospheric Disturbance (SID) Receiver
   
• A selection of robotics projects
   
• Bat detector (new)
   
• Vat detector (old)
   
• Variety of quick designs
   
• Gold wafer (smartcard) programmer
   
• Making a FRED photopopper
   
• Griffith Observatory Tesla Coil
   
• Fogger smoke machine
   
• Dinsmore 1490 digital compass
   
• Geiger counter
   
• Electric field disturbance monitor
   
• Inexpensive seismometer project
   
• Digital dial
   
• GPS receiver interface
   
• Doorbell for the Deaf
   
• Electromagnetic field detector
   
• Insect Repellant
   
• High Quality Intercom
   
• Magnetic Gun.
   
• Metal detector
   
• Static Electricity / Negative Ion Detector
   
• Ultrasonic dog whistle
   
• Popular Electronics Ultrasound Detector
   
• An Inexpensive X-ray Machine
   
• Magnetic levitation circuit
   
• PE3342 Programmer Schematic
   
• Schmidt Trigger
   
• u-Blox GPS receiver board
   
• Assorted digital circuits
   
• Basic electronic circuits
   
• Miscellaneous simple circuits
   
• Digital Call Sign Annunciator
   
• Ultrasonic switch
   
• Sound finding cricket with phase detector
   
• Sound finding cricket
   
• APRS GPS tracker schematic (PIC16C73)
   
• No loss capacitor
   
• Discrete logic decimal to BCD converter
   
• Doorbell extender
   
• Earthquake detector
   
• Electromagnetic levitator
   
• Jacob's ladder
   
• Magnetic ball levitator
   
• Photodiode amplifier
   
• Relative wind angle indicator
   
• Solid-stateTesla coil
   
• Very basic circuits
   
• Bat detector
   
• FCTS Project
   
• Smooth Tone Clickless CW Sidetone Generator
   
• Morse Code Beacon Keyer
   
• Lightning Activated Camera Shutter Trigger
   
• Three Power Supplies for the Garmin GPS-20 Sensor Board
   
• Driving N-channel FETs from TTL
   
• Miniature Self-Powered Autonomous Robot
   
• Electronic Dazer
   
• Morse Code Practice Keyer 1
   
• Morse Code Practice Keyer 2
   
• 741 Light Sensor
   
• Fluid level detector
   
• The Aisin-Seiki GPS-Receiver (The "US$20 GPS")
   
• Voltage follower with 1G ohm input (LM11)
   
• Double-ended flashing voltage monitor - LM10
   
• Full-duplex doorphone
   
• Morse code display
   
• Intercom schematic
   
• Pulse Induction Metal Detector
   
• Scaling ADXL50 accelerometer output
   

  Model and remote control schematics

• Snake throat muscle controller
   
• Handy cricket for robotic applications
   
• Incline Railway Control Circuit
   
• A Receive Signal Decoder
   
• One ounce rocket ejection timer
   
• LED traffic lights
   
• Two-tone siren
   
• Proportional radio remote control
   
• Alf: The Robotic Matchbox car
   
• Seaplane schematic
   
• Model Rocket with Video Camera
   
• Signal breaking module
   
• RF serial link for robot
   
• PIC based rocket altimeter
   
• Robot with PIC16F84 brain & InfraRed eyes
   
• 0-10V control for RC servos
   
• Robotic microcontroller board
   
• Autonomous airplane
   
• Multi Rocket Launcher
   
• Model rocket launch controller
   
• Simple flashing light circuit
   
• Simple flashing light circuit
   
• A dual alternating flashing light circuit
   
• Simple flashing light circuit
   
• A dual tandem flashing light circuit powered by a 9 volt battery
   
• Simulate the Gyralite (dual flashing headlights).
   
• Simple train detector using ambient light and a photocell
   
• Simple charge rate monitor
   
• Deluxe charge rate monitor
   
• "CLONEPAC" memory module for Futaba 8UAF/8UAP
   
• Battery pack discharger
   
• Plane locator
   
• Plane locator 2
   
• Battery low voltage alarm
   
• Battery low voltage alarm 2
   
• Ultimate battery low voltage alarm
   
• R/C digital camera controller
   
• R/C helicopter camera
   
• Building an RF Remote Control System
   
• Motor walker circuit
   
• Two tone train horn
   
• 27Mhz toy car receiver
   
• 27Mhz toy car transmitter
   
• R/C Emergency locator alarm
   
• Remote switch for radio-control aircraft accessories
   
• Radio Control Battery Backup
   
• Glow Plug driver for model engines
   

  Motor and general control schematics

• Bridge head
   
• Light activated relay
   
• Simple 10 Stage Control Box
   
• Simple PWM circuit
   
• H Bridge Motor Control Circuits
   
• Electronic Thermostat Relay Circuit
   
• Interfacing 5 volt CMOS to 12 volt loads
   
• Light Activated Relay
   
• CMOS Toggle Flip Flop With Relay(CD4013)
   
• 555 Timer Monostable Circuit Using Pushbutton
   
• Current loop interface
   
• Switching solenoid driver
   
• Modular relay system
   
• Light/dark detector
   
• Pulse Width Modulation DC Motor Control
   
• Stepper motor controller
   
• Touch switch
   
• Pump controller
   
• H-Bridge motor controller (5 amps, 100 watts)
   
• Dual Channel Servo Pulse to H-Bridge Interface
   
• Servo pulse to PWM converter
   
• 12V Sump Pump Control
   
• Transistor relay driver
   
• Latching relay driver
   
• Relay delay circuit
   
• Touch switch
   
• Low voltage DC motor speed controller
   
• Flashing neon christmas lights
   
• Three input first response monitor
   
• Switch-on delay circuit
   
• Electronic thermostat
   
• LM3911 temperature controller
   
• Programmable light-activated relay
   
• Rolling code 4-channel UHF remote control
   
• DC Motor Speed Controller
   
• 3 Phase Brushless DC Motor Xtal Based Controller
   
• DC motor controller
   
• Garden moisture controller
   
• Overload Voltage Protection with Automatic Reset
   
• Pulse Width Modulator
   
• Pulse Width Modulator Motor Speed Control
   
• Pushbutton one-shot and latch (PDF)
   
• Charge coupled bi-directional power MOSFET relay (PDF)
   
• Finger touch activated switch (PDF)
   
• Machine vibration triggers hour meter (PDF)
   
• Solid state relay (PDF)
   
• Line-powered Xenon flash transmitter (PDF)
   
• 9V Xenon photoflash controller (PDF)
   
• AC switching with TRIAC from TTL
   
• Control 120VAC relay with TTL
   
• Driving a relay with a CPU
   
• Power-line Appliance Controller
   
• DC Motor Constant Speed Control
   
• Simple Switched Servo Driver
   
• Combination-controlled, fully customizable RF remote control
   
• Thermoelectic controller (scriptable thermometer)
   
• Stepper motor positioner
   
• Stepper motor driver
   
• Thermostat
   
• Frequency switch
   
• PIC16F84 RF remote controller
   
• H-Bridge shematic
   
• DS1821 programmable thermostat
   
• SN754410 Dual Motor Driver Board
   
• Hot Water Tank Indicator
   
• Temperature monitor
   
• Cold activated switch
   
• Voltage comparator switch
   
• Dark activated switch
   
• DC Push Button Motor Control Circuit
   
• Light detector
   
• DC Motor Reversing Circuit
   
• Sound operated switch
   
• Touch Switches
   
• 6090 digital decoder schematics
   
• Assorted relay control circuits
   
• Adjustable Voltage motor controller
   
• Serial servo controller
   
• DC Motor-Driver H-Bridge Circuit
   
• Furnace fan speed controller
   
• Remote two-wire stepper motor positioner
   
• Drill shaft speed monitor
   
• PWM Motor Speed Controller / DC Light Dimmer
   
• Constant Temperature Circuit
   
• PWM DC Motor Speed Control
   
• Solenoid starter
   
• CO2 controller for planted tanks
   
• Light activated relay
   
• Voice activated switch - MC2830
   
• Delayed shutter control for Kodak DC-20
   
• Gasoline generator automatic throttle controller
   
• Block power switching module
   
• MOSFET H-BRIDGE schematic and theory
  
  
  
   

   

   

  Music related schematics (also see Audio)

• TA6CAA nın C1096 AC117 li transistorlu org devresi
• Drum machine
   
• Simple MIDI-to-CV converter
   
• Sounds effects unit
   
• ETI 603 Sequencer
   
• Synthesizer schematics
   
• Peak-reading meters
   
• Octave screamer
   
• Amiga MIDI interface
   
• Apple Mac to MIDI synthesizer interface cable
   
• Apple Macintosh MIDI interface schematic (basic version)
   
• Apple Macintosh MIDI interface schematic (deluxe version)
   
• Standard MIDI to MIDI interface cable diagram
   
• Simple MIDI switcher
   
• MIDI interface / cable tester
   
• MIDI keyboard
   
• MIDI merger schematic
   
• 25-pin PC serial port to MIDI synthesizer interface cable
   
• 9-pin PC serial port to MIDI synthesizer interface cable
   
• Serial MIDI interface
   
• Microcontroller MIDI interface
   
• MIDI keyboard circuit
   
• Spring reverb unit
   
• MIDI status indicator
   
• MP3 Player
   
• Metronome and pitch generator
   
• Mini metronome
   
• Compact Flash / IDE MP3 Player MKI
   
• Simple colour organ
   
• Guitar fuzz effect
   
• 8 note tune player
   
• Colour (Sound) Organ
   
• Transisor organ
   
• BookPC Car MP3 Player
   
• Yet Another Mobile MP3 Player
   
• Wave Multiplier for music synthesizers
   
• Audible metronome
   
• Visual metronome
   
• Vibrato Circuit for Guitar, Steel, Bass, Etc.
   
• Zonk Machine and Treble Booster
   
• Simple line mixer
   
• Simple MIDI tester
   
• ASM-1 Analog Synthesizer Module
   
• MIDI Controller Footpedal
   
• DIY Serial MIDI Interface (80C51/80C31 Version)
   
• Electronic metronome
   
• Sound Effects Generator
   
• Sound Effects Generator 2
   
• Digital Guitar Tuner
   
• Drum tone oscillators
   
• Stereo compressor
   
• Analog MIDI synthesizer
   
• Spring reverb
   
• MIDI to CV interface
   
• Dual phantom power pre-amp
   
• Four channel fuzz box
   
• Theremin controller
   
• Vocal zapper
   
• MIDI Drum Machine Analog Input Schematic
   
• Kinetic images from sound
   
• Guitar Reverb Pedal
   
• Guitar Tremolo Unit
   
• Spring Reverb Unit For Guitar
   
• Ultra Simple Bass Guitar Compressor
   
• Vox AC30 Guitar Amplifier Simulator
   
• Guitar Vibrato Unit
   
• Musical Instrument (Expandable) Graphic Equaliser
   
• Midibox 64
   

  PC related schematics

• I2C printer port adaptor
   
• RS232C Level Converter
   
• Isolated Full Duplex RS232C Interface
   
• PC Serial Receiver (57.6K Baud / TTL & CMOS)
   
• PC Serial Port Receiver
   
• Parallel Port Relay Interface
   
• PC based 7-segment rolling display
   
• DB-9 Connector to DB-25 (both RS-232)
   
• Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25
   
• Parallel print capture system
   
• ZX96-Mainboard
   
• Modem Rockwell RCV336/ACF model V1433VQR ext.
   
• Genius Mouse schematics
   
• EEPROM programmer
   
• Macintosh interface for X10 MR26A Wireless Receiver
   
• Sound Card Interface with Tone Keyer
   
• Ericsson phone to PC serial port interface
   
• PC serial port receiver
   
• Parallel port relay interface
   
• ISA 48 I/O digital card
   
• Jupiter card programmer
   
• USB to RS232 Dongle
   
• Commodore 64 24-bit parallel port interface with 8255
   
• Parallel (Printer) Port Interface
   
• RS-232 line monitor and loopback cables
   
• The KD2BD Pacsat Modem
   
• A Serial Infrared Remote Controller
   
• PC Serial and Parallel Port Software and Interfaces
   
• Interfacing 16x2 character :LCD to parallel port
   
• RS-232 Protocol Analyser
   
• Interface cable for Casio QV-200 digital camera
   
• Radio clock for PC's
   
• Serial to ECP interface
   
• A PC-Based LowFER Frequency Synthesizer
   
• General purpose 48-bit ISA parallel I/O card
   
• Power from RS-232 port
   
• PCI to ISA converter
   
• WatchDog for ISA Bus
   
• 4-channel 8-bit analog-to-digital converter for PC
   
• Printer port ADC
   
• Parallel port ADC based on MAX147
   
• Analog Signal Acquisition for PC Printer Port
   
• More accurate PC/AT clock
   
• Getting power from RS-232 interface
   
• Barcode scanner
   
• PC thermometer
   
• Dive computer interface
   
• Parallel port servo controller
   
• GPS receiver (Gamin, Eagle etc) to PC interface cables
   
• Connect two CD-ROM drives to one soundcard
   
• Headphone driving circuit for soundcards
   
• Get power out of PC parallel port
   
• Null Printer Adapter
   
• PC speaker volume control circuit
   
• How to get power from PC to your circuits
   
• RS-232 surge protection
   
• Simple RS-232 serial port buffer circuit
   
• Get power out of PC RS-232 port
   
• Sound Blaster Microphone Preamplifier
   
• Sega 3D glass interfacing circuits
   
• Convert Atari-style joystick to PC joystick port
   
• Fake Joystick circuit
   
• Using the joystick port as general purpose input
   
• Connect other circuits to PC joystick port
   
• Schematic of a standard PC joystick
   
• Simple PC SmartCard reader
   
• Fax to modem interface
   
• PC interface for point controller
   
• Linux Infra-red Remote Control (LIRC)
   
• Compter microphone
   
• Laptop Computer Serial Port Power Booster
   
• Assorted computer interface circuits
   
• HamComm Interface
   
• Apple II/II+/IIe IDE Drive Interface
   
• Basic Stamp I & PC Relay Controller
   
• CompactFlash to IDE interface
   
• ATX power supply schematic
   
• X-Y plotter for PC
   
• PC based cable tester
   
• Hi-Fi PC Speaker System
   
• IDE hard-disk interface for Amiga 500
   
• How to construct Garmin GPS receiver interface cables
   
• iRDA printer adapter
   
• 160 Baud ALDL Hardware Interface
   
• AT PC Power Supply 1
   
• AT PC Power Supply 2
   
• AT PC Power Supply 3
   
• AT PC Power Supply 4
   
• AT PC Power Supply 5
   
• iLINK Interface
   
• Digital Signals Decoding Interfaces
   
• 9-pin null modem cable
   
• Simple RS-232 receiver
   
• +5v from RS-232 - LM78L05
   
• RS232 - Lowe HF-225 interface
   
• 24-bit parallel port interface with 8255 for Commodore computer
   
• Supply Derives Power From 3-Wire RS-232 Port
   
• 24-line PC digital interface (PDF)
   

  PDA interfaces and related schematics

• Tilt sensor for the PalmPilot
   
• Casio interface circuits
   
• SHARP palm-top/hand-held to RS232 serial converter
   
• MIDI interface for Palm computers
   
• MIDI interface for Palm cradle
   
• MIDI interface for Visor USB
   
• MIDI-USB Cradle for Visor (Deluxe, Platinum)
   
• MIDI interface for Visor
   
• Interfacing ultrasonic range finder to BrainStem
   
• Hamamatsu UVTron Interface to a BrainStem
   
• Pulse Shaping on the Palm Pilot
   
• Casio interface cable
   
• Casio organiser hardware
   
• Casio datalogger
   
• Interfacing ADXL202 accelerometer to PalmPilot
   
• PalmPilot audio interface
   
• PalmPilot cradle to modem adapter
   
• PalmPilot connector pinouts
   
• PalmPilot serial port interface
   
• PalmPilot memory schematics
   
• Aladin interface
   
• PalmPilot turbo boost guage interface
   
• Aladin interface using op-amp
   
• Wireless local network for PalmPilot (large PDF)
   

  Power supplies and control schematics

• ±12V supply accepts 9 to 30V inputs
   
• Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VAC
   
• Alkaline battery charger
   
• Basic increase in DC voltage
   
• Power Tool Torque Control
   
• Generating Negative 5 Volts from 9 Volt Battery
   
• LED Battery Condition Indicator
   
• LM317 Variable Voltage Regulator
   
• LM317 Regulator With Pass Transistor
   
• High Current Regulated Power Supply
   
• Simple Variable Voltage Source
   
• Various switching power supplies
   
• Variable 3 - 24 Volt / 3 Amp Power Supply
   
• 2 watt switching power supply
   
• Variable Voltage and Current Power Supply
   
• Low Power DC to DC Converter
   
• Constant Current Battery Charger
   
• Variable DC power supply
   
• Nicad battery charger
   
• Simple power supply
   
• Voltage converter
   
• Bench power supply
   
• Easy power supply
   
• Valve power supply
   
• 6V to 12V Converter
   
• Tesla coil / HV generator
   
• High Current Power Supply
   
• Dual Polarity Power Supply
   
• High Voltage High Current Power Supply
   
• Transformerless Power Supply
   
• Fixed Voltage Power Supply
   
• Voltage Inverter
   
• Voltage Inverter
   
• Dual power supply
   
• 1A Variable Regulated Power Supply
   
• Negative voltage generator
   
• 12V battery capacity tester
   
• NE555 Low Voltage Battery Disconnect Circuit
   
• 13.5KV power supply
   
• Kirlian device supply
   
• LM317 adjustable power supply
   
• LTC1265 Nicad charger
   
• Single cell lithium battery charger
   
• Smart battery charger
   
• Battery charge indicator
   
• Lead acid trickle charger
   
• 12B Battery condition indicator
   
• 33 Volt DC To DC Converter
   
• Automatic AC voltage (110/240) selector
   
• Variable 0-5A Current Source
   
• Ground Fault Interupter
   
• Intelligent battery charger
   
• 12 Volt DC Load Control and Battery Protection
   
• Low battery indicator
   
• Variable power supply
   
• Switching Power Supply
   
• Low Power DC Quadrupler
   
• Surge protector
   
• Ultimate power supply
   
• Variable Regulated Power Supply
   
• Power reminder beeper (PDF)
   
• Unplugged power cord alarm
   
• Machine power loss beepter (PDF)
   
• Low-dropout 12V regulator (LM324)
   
• HV supply: 12VDC in, 12KV out
   
• Generating -5VDC from +5VDC
   
• Filtering PC bus POWER
   
• Bidirectionall power inverter
   
• High current regulated power supply
   
• One 9V battery gives +18, +25, +33V
   
• +9V *and* -9V from one battery
   
• Battery charger
   
• Adjustable power supply using LM317
   
• Simple +5V power supply circuit
   
• 12 Vdc - 120 Vac Inverter Schematic
   
• +12V/-12V Power supply unit
   
• +/-12V -> +/-5V Power unit
   
• +5V Switching regulator (1)
   
• Switching regulator (2)
   
• Electric power controller
   
• +30V power supply with +5V
   
• +30V DC-DC converter
   
• DC/AC inverter (2)
   
• DC/AC inverter (1)
   
• PIC16F873 DC motor speed controller
   
• 5v Regulated Power Source
   
• 12V 30A power supply
   
• Dual regulated power supply
   
• Fuse blown indicator
   
• Gyrator circuit
   
• Variable power supply
   
• LM317 Regulator Circuit
   
• Nicad battery charger
   
• Regulated 12V supply
   
• Unregulated power supply
   
• Snowmobile GPS power adapter
   
• Simple switching power supply
   
• Assorted power source and control circuits
   
• 12 volt battery monitor
   
• 12 volt power supply
   
• 5 volt power supply
   
• Battery voltage monitor
   
• LM3914 battery monitor
   
• Multiple voltage power supply
   
• Voltage doubler
   
• Voltage inverter
   
• Automatic Reset Circuit for Astron Power Supply's
   
• One-hour battery charger
   
• Battery pack capacity indicator
   
• Prevision half-wave AC to DC converter
   
• Unity gain half-wave rectifier
   
• PWM Motor Speed Controller / DC Light Dimmer
   
• PWM Motor/Light Controller
   
• Low Power LED Voltmeter
   
• PWM Motor/Light Controller
   
• PWM Motor/Light Controller variants
   
• Low Power LED Voltmeter
   
• Temperature Controlled NICD Charger
   
• Simple Capacitance Multiplier Power Supply For Class-A Amplifiers
   
• 'Rounding Off' a square wave
   
• Switch debounce using 555
   
• Square wave to sine wave converter
   
• Day / Night / 24 Hour Select Sensor
   
• One transistor timer
   
• Variable timer
   
• Micropower pulse generator (PDF)
   
• Square wave oscillator
   
• Triangle wave oscillator
   
• Sawtooth wave oscillator
   
• Sine/Cosine wave oscillator
   
• 555 timer
   
• 555 oscillator
   
• Stable multivibrator (IC)
   
• Stable multivibrator (Transistor)
   
• Push Button Switch Debouncer
   
• Square wave oscillator
   
• 5 to 30 Minute Timer
   
• NE555 Basic Monostable
   
• Mini DDS (Direct Digital Synthesis)
   
• Astable Multivibrator
   
• AD9852 DDS schematic
   
• A GPS receiver based frequency standard
   
• Adjustable phase quadrature generator
   
• Counter speed doubler
   
• Fast rise-time multivibrator
   
• Sample-hold controlled oscillator
   
• Sine wave oscillator
   
• LM3900 sine wave oscillator
   
• CMOS 4011 oscillator
   
• Simple frequency doubler
   
• Sinewave frequency doubler
   
• 555 timer circuits
   
• Linear voltage to frequency converter
   
• Voltage controlled triangle / square generator
   
• Monostable multivibrator
   
• Clock generator
   
• 555 Timer Tutorial + Circuits
   
• Frequency comparator - 74HCT74
   
• Clock frequency doubler
   
• Versatile electronic timer
  voltage power supply
   
• Voltage doubler
   
• Voltage inverter
   
• Automatic Reset Circuit for Astron Power Supply's
   
• One-hour battery charger
   
• Battery pack capacity indicator
   
• Prevision half-wave AC to DC converter
   
• Unity gain half-wave rectifier
   
• PWM Motor Speed Controller / DC Light Dimmer
   
• PWM Motor/Light Controller
   
• Low Power LED Voltmeter
   
• PWM Motor/Light Controller
   
• PWM Motor/Light Controller variants
   
• Low Power LED Voltmeter
   
• Temperature Controlled NICD Charger
   
• Simple Capacitance Multiplier Power Supply For Class-A Amplifiers
   
• Simple DC Adapter Power Supply
   
• Variable Dual Lab Power Supply
   
• Battery Charger Ideas
   
• Charger for gel lead acid batteries
   
• 12V to 120VAC inverter
   
• Nicad battery cycler
   
• Micropower 10ppm/°C, +/-5v reference
   
• Battery Characterizer
   
• Nicad Battery Discharger/Capacity Indicator
   
• 200 Watt Modified PC Power Supply 13.5 Volt 14 Amp
   

  Radio-frequency schematics (also see Transmitters)

• CW RECEIVER 40/80 meter CW receiver
   
• Hüsnü Köktürk LW MW.. one tune receiver
   
• TRF AM Receiver circuit
   
• WLW 500KW Transmitter Schematic
   
• AM-Receiver for Aircraft communication (118.250MHz)
   
• AM receiver for aircraft communications
   
• 80 Meter CW ARDF receiver
   
• CW zero beat indicator (PDF)
   
• Build your own VLF Receiver
   
• Receiver building blocks
   
• Simple wireless radio data link
   
• Vibrating pocket bug detector
   
• 2MHz RF Oscillator
   
• 50-150MHz Overtone Oscillator
   
• Simple Op-Amp Radio
   
• UHF - 100W Transistorized amplifier
   
• 50MHz Converter
   
• Superregenerative 27MHz receiver
   
• RF front-end for triple conversion GPS receiver
   
• 2M - 20M transverter
   
• Improved CMOS RF PLL sythesizer
   
• Harmonic oscillator
   
• Direction finder system
   
• One transistor regenerative receiver
   
• Synthesized HF receiver
   
• TBA120 narrowband FM receiver
   
• TDA7000 receiver
   
• ZN414 receivers
   
• 10W HF linear amplifier
   
• 500W HF linear amplifier
   
• 3W HF QRP linear amplifier
   
• Phasing SSB exciter
   
• 500mW HF linear amplifier
   
• Generic VHF power amplifier
   
• 10.7MHz FM detector
   
• RTTY terminal unit
   
• Q-multiplier
   
• CMOS RF PLL sythesizer
   
• No-tune 10GHz transceiver
   
• No-tune 1296, 2304 AND 5760MHz transceiver
   
• 13cm PSK transceiver for 1.2Mbit/s packet radio
   
• Wide-band FM transceiver
   
• 3W FM Transmitter
   
• Crystal radio
   
• Op-Amp Radio
   
• Car radio tunes the Amateur Bands
   
• Crystal set that requires no antenna
   
• 80m Direct Conversion Receiver
   
• A compact L-match ATU for portable use
   
• Morse Adaptor for your VHF/UHF FM rig
   
• An end-fed antenna, L-match coupler and resistive bridge for HF
   
• AM Broadcast Band Regenerative Receiver
   
• 50 MHz to 146 MHz Converter
   
• Hear Amateurs on your Shortwave Radio!
   
• Compact 20 14 MHz direct conversion receiver
   
• Hear Amateurs on your FM Radio!
   
• RF actuated CW monitor
   
• LF to HF Converter
   
• Super 80 ultra-simple SSB receiver for 3.5 MHz
   
• Class B series modulator
   
• L-Band PHEMT LNA for GPS, Inmarsat etc
   
• Advanced VHF power meter
   
• The MRX-40 Mini Receiver
   
• Phase Shift Radio Direction Finder
   
• 23cm Data Transceiver
   
• UHF oscillator
   
• Economoy short-wave radio
   
• Linearized RF detector
   
• Two-band radio
   
• Shortwave conveter for scanners
   
• FM Bug
   
• AM Radio
   
• Toroidal coil RF shortwave receiver
   
• Crystal radio
   
• AM Broadcast Band Active Antenna
   
• Active antenna with gain
   
• Ham Band VFO
   
• HF Signal generator
   
• Simple AM Radio Receiver & Amplifier
   
• Bug detector
   
• 175KHz inductive pulse receiver (PDF)
   
• 200-400 MHz voltage controlled oscillator
   
• AM/FM/SW active antenna
   
• RF Sniffer <.5 to >500 MHz
   
• Demodulator Schematic/Design
   
• AM BCB radio receiver
   
• Regenerative shortwave receiver
   
• DSBSC (Double Side Band Supressed Carrier)
   
• GPS (L1) Jammer
   
• Frequency Synthesizer
   
• Four Channel Wireless Transmitter and Receiver
   
• Talking receiver
   
• 418MHz Control RX/TX
   
• PLL synthesizing oscillator (1)
   
• PLL synthesizing oscillator (2)
   
• PLL synthesizing oscillator (3)
   
• 2N2222 40 Meter CW/DSB Transceiver
   
• Yaesu FT-736R doppler compensation
   
• AM receiver
   
• Field strength meter
   
• MPF102 receiver
   
• MW preamplifier
   
• Q - Multiplying Loop Antenna
   
• SW aerial amplifier
   
• Simple field strength meter
   
• 4 band double-tuned preselector
   
• UHF Amplifier
   
• UHF Preamplifier
   
• ZN414 AM receiver
   
• ZN414 shortwave receiver
   
• Phased lock loop schematic
   
• 30M PSK31 Transceiver
   
• SOP receiver (PDF)
   
• SOP direct conversion receiver
   
• Receiver
   
• 30m direct conversion receiver
   
• Popcorn direct conversion receiver
   
• 40m direct conversion receiver
   
• 80m direct conversion receiver
   
• 136 kHz direct conversion receiver
   
• One Watt 2.45 GHz Linear Amplifier
   
• 222 MHz Transverter
   
• VFO from 2001 ARRL Handbook, page 17.74
   
• VFO from 2001 ARRL Handbook, page 14.20
   
• Assorted RF circuits
   
• 14MHz SSB 10mW Transceiver
   
• Building a Simple LF Exciter
   
• Yaesu band decoder schematic
   
• 5 watt, 80 meter QRP CW Transceiver
   
• How to Build a 300MHz AM, RF Remote Control System
   
• Penncrest 5905 Stereo Receiver
   
• Wireless remote control system
   
• RF Modem Robotics Project
   
• PLL FM transmitter
   
• Improved FM Stereo Modulator
   
• Smooth Tone Clickless CW Sidetone Generator
   
• Variety of receiver converter projects
   
• One transistor FM receiver
   
• 42 Mc Band to 88 Mc Band (retrofit converter) Project
   
• Crystal radio circuits including diode performance comparison
   
• 50MHz Assistant (Preamp & Power Amp.)
   
• Bug detector
   
• Basic RF oscillator
   
• AM/FM/SW active antenna
   
• Superregenerative 27MHz receiver
   
• RX3302 receiver module schematic
   
• 49MHz walkie-talkie
   
• Radio Control Electric Switch
   
• 56K RF Modem
   
• Crossed dipole GPS antenna
   
• 80M ARDF direction finder
   

  Telephone and intercom related schematics

• Telephone In-Use LED Indicator
   
• Telephone In-Use Relay Controller
   
• Telephone audio interface
   
• Infinity Transmitter Schematic and Plans
   
• Digisound ring modulator
   
• Incoming call indicator
   
• Telephone Ring Generator Using 60Hz Power Transformer
   
• Telephone Ring Generator Using Switching Power Supply
   
• Telephone In-Use LED Indicator
   
• Telephone In-Use Relay Circuit
   
• Telephone Audio Interface
   
• Ringing Phone Light Flasher
   
• Phone Busy Indicator
   
• FM Telephone Bug
   
• Cut Phone Line Detector
   
• Simple Phone Tap
   
• Telephone Hold Button
   
• Telephone Recorder
   
• Cut phone line detector
   
• Simple phone tap
   
• Telephone auto record
   
• Telephone hold button
   
• Telephone recorder
   
• DTMF tone decoder (Basic Stamp / SSI-202)
   
• DTMF Generator/Decoder
   
• Telephone recording circuit
   
• Interface cables for various cell phones
   
• Nokia 3210 MBUS interface
   
• Telephone music on hold box
   
• Telephone ring controlled relay
   
• 1-line telephone status indicator (PDF)
   
• Line in use indicator (PDF)
   
• 4-line telephone status indicator (PDF)
   
• Caller ID decoder
   
• Telephone in use light
   
• Detecting a telephone RING
   
• Phone In-Use Light
   
• Phone to audio interface
   
• Phone Off-Hook Indicator
   
• 'phone rang' indicator light
   
• Phone Line to Audio
   
• Phone in-use
   
• Telephone Line Monitor
   
• Use old phones as an intercom
   
• Phone-In-Use indicator
   
• Hold function for Telephone
   
• Digital/Standard Phone Line Tester
   
• Caller ID decoder part 1
   
• Caller ID decoder part 2
   
• DTMF decoder / logger
   
• FM telephone bug
   
• Universal telephone hold
   
• Talking phone dial monitor
   
• Red box detection circuit (PDF)
   
• Telephone line simulator
   
• Telephone privacy adapter
   
• Telephone ringing circuits
   
• Simple circuit to connect telephone equipment to audio mixer
   
• NCDS Interface Schematic for Nokia 3110, 8110, 8110i
   
• Assorted telephone circuits
   
• Telephone call director (mini PABX)
   
• Phone line sentinel
   
• Telephone ring detector
   
• Telephone line simulator
   
• Cut phone line detector
   
• Telephone ring detector - 4N35
   
• Phone-line privacy circuit
   
• Telephone autodialler
   
• Taxi phone automatic dialler
   

  Hüsnü Köktürk test devreleri circuits schematics

• fet transistor xtal test aleti
   
• Hüsnü köktürk e ait çeşitli test devreleri
   
• Köktürk one transistor xtal tracking bip bip osilator
   
• Frequency counter
   
• 50 MHz frequency counter, voltage meter & SWR/PWR indicator
   
• Owens Bridge Inductance Measurement Device
   
• ESR Meter
   
• Line Output / Flyback transformer tester
   
• PC-Based Digital Storage Oscilloscope (DSOA)
   
• PC Based Digital Storage Oscilloscope Mk3
   
• Simple 6-Digit 40MHz Frequency Counter Module
   
• Capacitance meter
   
• Capacitance meter
   
• AC Line Current Detector
   
• Triangle and Squarewave Generator
   
• Signal tracer / injector
   
• Voltage probe
   
• Live line detector
   
• 220V live wire-in-wall scanner
   
• Grid dip meter
   
• PCB VSWR bridge
   
• Electric field & leakage detector
   
• Simple polarity detector
   
• RCM710 Electronic Scale
   
• 3 - 12 MHz Signal Generator
   
• Some simple test equipment to build
   
• RF Power Meter for the QRPer
   
• Dip Oscillator for HF
   
• Two Tone Audio Oscillator (use for SSB tests)
   
• Audible continuity tester
   
• Wire tracer
   
• Signal generator for signal tracer
   
• Electronic level
   
• Digital volt meter
   
• Adjustable continuity tested
   
• Simple pH meter
   
• Temperature compensated pH meter
   
• pH meter with calibration
   
• Four Channel Oscilloscope Adapter
   
• Arbitrary Waveform Generator
   
• Digital Pressure Gauge
   
• Remote Field Strength Meter
   
• Digital frequency counter
   
• Function generator
   
• High / Low indicator
   
• AC/DC LED Indicator
   
• Micro ohm meter
   
• Micro volt probe
   
• MOSFET tester
   
• Power factor meter
   
• Ramp generator
   
• LASER/LED light output intensity meter (PDF)
   
• Frequency and capacitance meter
   
• Resistor decade box
   
• 1.2GHz frequency counter
   
• Simple light sensor adapter for oscilloscope
   
• Time Domain Reflectometer (TDR)
   
• UTP cable tested
   
• pH Meter
   
• Multi Wire Cable Tester
   
• Connection tester
   
• EMF field probe
   
• Function generator
   
• Logic probe
   
• Zener diode tester
   
• Mini DDS (direct digital synthesizer)
   
• LCD frequency counter (PIC16F84)
   
• Light meter
   
• Tonal voltmeter gives audible indication of voltage level
   
• AC Millivoltmeter
   
• DC millivolt meter
   
• Fluxmeter to DVM input
   
• XR2206 function generator
   
• Low-cost dot/bar generator
   
• Milli-ohm adapter
   
• Deflection amplifier for oscilloscopes
   
• Polarity sensing continuity tester
   
• Sensitive RF voltmeter
   
• Signal injector
   
• Pulse Reading Logic Probe
   
• Pink Noise Generator for Audio Testing
   
• Audio Millivoltmeter
   
• Audio Test Oscillator
   
• Full Featured Transistor Tester
   
• Opamp Design and Test Board
   
• Microphone Circuit Test Oscillator
   
• Distortion Analyser
   
• Self Oscillating Amplifier for Distortion Testing
   
• 120MHz frequency counter
   
• Build a Magnetic Field Immunity Tester
   
• 555 Timer IC Tester
   
• 555 go / no-go tester
   
• 12V Lead-Acid Battery Monitor
   
• Continuity tester 2
   
• Continuity tester
   
• Logic probe
   
• 4-channel DSO for oscilloscope
   
• Beeper to find short circuits
   
• 220V wiring detector
   
• In-circuit electrolytic tester
   
• PIC logic probe with pulser
   

  Timing, oscillators etc. (schematics)

• Budget timer
   
• 1 Second Time Base From Crystal Oscillator
   
• Countdown timer with relay
   
• DDS using AD9835
   
• 1 Second Time Base From Crystal Osc.
   
• Power-On Time Delay Relay Circuit
   
• Low Voltage , High Current Time Delay Circuit
   
• Power-Off Time Delay Relay Circuit
   
• Generating a Delayed Pulse With a dual 555 Timer
   
• 1KHz Sinewave generator
   
• Timed beeper
   
• Time Delay Relay
   
• Time Delay Relay
   
• Wide-swing Variable Crystal Oscillator
   
• Circuit that momentarily closes a pair of contacts at long intervals
   
• Long period timer
   
• 555 time delay circuit
   
• Low frequency clock
   
• 4-Bit binary clock
   
• Onboard Fogger Timer
   
• Colpitts 1 to 20 MHz Crystal Oscillator
   
• Divide By 1-1/2 Circuit
   
• Simple sinewave generator
   
• Two Transistor Sine Wave Oscillator
   
• 10 Hz to 10 Khz VCO with Square and Triangle wave
   
• Line powered 60Hz clock generator (PDF)
   
• Micro-power pulse generator (PDF)
   
• Darkroom camera shutter timer
   
• Divide by 1.5 counter (PFD)
   
• High-output square wave generator (PDF)
   
• D Flip-flot one-shot circuits (PDF)
   
• Clock divider
   
• Clock doubler
   
• CMOS oscillator
   
• Crystal 32.768KHz CMOS Oscillator
   
• Crystal oscillator
   
• Cheap 40KHz clock
   
• Stable 40KHz clock
   
• 'Rounding Off' a square wave
   
• Switch debounce using 555
   
• Square wave to sine wave converter
   
• Day / Night / 24 Hour Select Sensor
   
• One transistor timer
   
• Variable timer
   
• Micropower pulse generator (PDF)
   
• Square wave oscillator
   
• Triangle wave oscillator
   
• Sawtooth wave oscillator
   
• Sine/Cosine wave oscillator
   
• 555 timer
   
• 555 oscillator
   
• Stable multivibrator (IC)
   
• Stable multivibrator (Transistor)
   
• Push Button Switch Debouncer
   
• Square wave oscillator
   
• 5 to 30 Minute Timer
   
• NE555 Basic Monostable
   
• Mini DDS (Direct Digital Synthesis)
   
• Astable Multivibrator
   
• AD9852 DDS schematic
   
• A GPS receiver based frequency standard
   
• Adjustable phase quadrature generator
   
• Counter speed doubler
   
• Fast rise-time multivibrator
   
• Sample-hold controlled oscillator
   
• Sine wave oscillator
   
• LM3900 sine wave oscillator
   
• CMOS 4011 oscillator
   
• Simple frequency doubler
   
• Sinewave frequency doubler
   
• 555 timer circuits
   
• Linear voltage to frequency converter
   
• Voltage controlled triangle / square generator
   
• Monostable multivibrator
   
• Clock generator
   
• 555 Timer Tutorial + Circuits
   
• Frequency comparator - 74HCT74
   
• Clock frequency doubler
   
• Versatile electronic timer
   

  Transmitter schematics (also see RF)

• Telsiz-takoz-Transmitter
   
• Li'l 7 AM Transmitter Schematic
   
• Portable 40W CW transmitter
   
• A 3m (100 MHz) small bug
   
• Basic FM Transmitter
   
• Micro Power AM Broadcast Transmitter
   
• FM Beacon Transmitter (88-108 MHz)
   
• 1 valve CW transmitter
   
• 250mW HF CW transmitter
   
• 2 valve CW transmitter
   
• Transmitter using LM317
   
• 5 Watt HF CW transmitter
   
• Simple FM microphone
   
• FM bug
   
• High power FM bug
   
• 27MHz AM/CW transmitter
   
• Easy 2-meter transmitter
   
• QRP HF transmitter
   
• Spark gap transmitter
   
• QRP SSB transmitter
   
• Crystal controlled FM transmitter
   
• 150mW FM transmitter
   
• FM transmitter
   
• Two Valve 40m CW Transmitter
   
• Frequency agile 80m CW QRP transmitter
   
• 80 metre DSB transmitter
   
• One Valve CW transmitter
   
• 3W FM transmitter
   
• FM transmitter (room bug)
   
• Microphone Transmitter (bug), 100 MHz
   
• Small FM transmitter
   
• Wireless microphone
   
• XTAL locked tone transmitter
   
• AM oscillator for wireless microphones
   
• Wireless microphone
   
• 1W CW Transmitter
   
• Simple Low FER Transmitter
   
• 7Mhz AM/CW Amateur Radio Transmitter
   
• VHF FM transmitter
   
• Simple FM transmitter
   
• Wireless microphone
   
• Shortwave radio transmitter
   
• 175KHz inductive pulse transmitter (PDF)
   
• 7MHz QRP transmitter
   
• Small Radio Transmitter
   
• FM Telephone Transmitter
   
• FM transmitter
   
• 4 transistor transmitter
   
• FM transmitter
   
• Op-amp based FM transmitter
   
• Tracking transmitter
   
• 5W PLL Transmitter
   
• Miniature FM transmitter
   
• Sensitive FM transmitter
   
• Simple RF transmitter
   
• 1.5 volt tracking transmitter
   
• Tracking transmitter
   
• Micro Power FM Broadcasting Circuits
   
• Low Power FM Transmitter
   
• RF/SS Handie Hopper Transmitter Schematic
   
• 30-Meter QRP Transmitter for Morse Code
   
• Miniature FM Transmitter #1
   
• Miniature FM Transmitter #2
   
• Miniature FM Transmitter #3
   
• Light sensing RF transmitter
   
• Micro-Spy with FETs
   
• Micro-Spy with USW
   
• Micro-Spy with TTL
   
• AM radio tone transmitter - 4049
   
• Op amp based AM radio transmitter
   
• 433MHz transmitter using SAW resonator
   

  Solar-powered schematics

• Solar charge controller
   
• Solar robots
   
• Solar Tracker
   
• 1381 solar engine
   
• D1 solar engine
   
• FLED solar engine
   
• PM1 solar engine
   
• Sun tracking circuit for solar arrays
   
• Solar power recharger
   
• Solar power supply
   
• Solar car array controller schematic
   
• Solar car battery monitor schematic
   
• Solar car brake controller schematic
   
• Solar car main controller schematic
   
• Solar car display controller schematic
   
• Solar car electrical design and circuit index
   
• Portable solar battery charger
   
• Sensor Electronic Tracker with H-Bridge Drive
   
• Sensor Electronic Tracker with Simple Solar Charge Controller
   
• Solar tracking control system
   
• LED7 solar tracker
   
• Solar step-down regulator
   
• Zener-based solar engine
   
• AA battery solar charger
   
• AA battery solar charger
   
• Solar Panel Charge Controller / Low Voltage Disconnect Circuit
   
• Solar Panel Current Meter
   
• SCC2 10 Amp Solar Charge Controller
   
• Solar Charged LED Flashlight
   
• AA battery solar charger
   
• Solar Panel Charge Controller / Low Voltage Disconnect Circuit
   
• Solar Panel Current Meter
   
• Solar cell Nicad charger
   
• Solar powered dock lamp flasher
   

  Video related schematics

• Video Clock Superimposer
   
• Simple TV transmitter
   
• Audio / video distribution amplifier
   
• 10GHz video link
   
• Experimental macrovision remover
   
• VHF/UHF TV modulator
   
• LH0032 video amplifier
   
• LM359N video amplifier
   
• 8 x 8 Audio-video switch
   
• Macrovision code remover
   
• 2.3GHz ATV Transmitter
   
• Driver for multiple VGA monitors
   
• CCD (charge coupled device) support board
   
• Closed-Caption Decoder
   
• PIC-Tock video clock
   
• Video/Audio Wireless Transmitter
   
• Video signal amplifier
   
• RGB video digitizer
   
• Digital video processor
   
• MC1374 based TV transmitter
   
• TV transmitter
   
• Simple TV transmitter
   
• Color Bar Generator
   
• Microcontroller test pattern generator
   
• NTSC Video Distribution Amplifier
   
• Commodore RF modulator
   
• Video signal edge enhancement
   
• Video amplifier
   
• Video stabilizer
   
• Video/Audio Wireless Transmitter
   
• 4 Stage 555 Timer for Video Cam Control
   
• Digital volt meter with video output
   
• VHF Audio Video Transmitter
   
• LH0024 video amplifier
   
• Video to RF Modulator
   
• Video switcher (PDF)
   
• Video switcher
   
• TV/Radio antenna cable galvanic isolator
   
• S-video to composite video adapter
   
• VGA converter for video projectors and fixed frequency monitors
   
• VGA to TV converter
   
• VGA to PAL and NTSC converter
   
• PIC micro frame grabber (TDA8708)
   
• Low cost audio/video modulator and transmitter
   
• Many video amplifier circuits includiing transmission over UTP (PDF)
   
• Commodore 64 Video Modulator 251025 Schematics
   
• Commodore 64 Video Modulator 251696 Schematics
   
• TV RGB signal output from a SVGA graphics card
   
• Macrovision removal
   
• Panasonic TR-329B AC-DC Portable TV
   
• Homebuilt video digitizer Mark I
   
• Homebuilt video digitizer Mark II
   
• Audio-video switch
   
• TV

   

   
• regenalicilinkleri.htm
• Analog opto-isolator
  
• Pulse width modulators (PWM)
  
• A href="http://www.4qdtec.com/rci.html">Pulse width to voltage converterBR>
• Fantastic Atom Expander
  
• Black Light
  
• Computerize Your Room/Home
  
• Flash slave trigger
  
• A Visual CW Zero Beating Aid
  
• A two-way Morse practice set
  
• Magnetic levitation device
  
• Tesla power receiver
  
• Lazer Tag Equipment Modifications
  
• Garmin GPS data interconnect
  
• Inexpensive APRS Weather Station
  
• Walking robot
  
• Vibrating Pocket Bug Detector
  
• Basic op-amp circuits
  
• Electronic fish lure
  
• Ultrasonic sound receiver
  
• Experimental data transmitter for fiber optics
  
• Experimental fiber optic receiver
  
• Ion detector
  
• Darkness monitor
  
• Electroscope
  
• Simple event counter
  
• Geiger counter
  
• Light detector
  
• Short-circuit beeper
  
• LM 1800 FM stereo decoder
  
• Glitch detector
  
• MAX924 bar-graph level gauge
  
• Ultrasonic generator
  
• Negative ion generator
  
• ELF Monitor
  
• Power line FM intercom
  
• Intercom circuit
  
• Lightning Storm optical interrupter (PDF)
  
• Simple nitrogen spark generator (PDF)
  
• Ultrasonic transducer oscillator circuit
  
• Build logic gates using discrete parts
  
• Jacob's Ladder
  
• Sudden Ionospheric Disturbance (SID) Receiver
  
• A selection of robotics projects
  
• Bat detector (new)
  
• Vat detector (old)
  
• Variety of quick designs
  
• Gold wafer (smartcard) programmer
  
• Making a FRED photopopper
  
• Griffith Observatory Tesla Coil
  
• Fogger smoke machine
  
• Dinsmore 1490 digital compass
  
• Geiger counter
  
• Electric field disturbance monitor
  
• Inexpensive seismometer project
  
• Digital dial
  
• GPS receiver interface
  
• Doorbell for the Deaf
  
• Electromagnetic field detector
  
• Insect Repellant
  
• High Quality Intercom
  
• Magnetic Gun.
  
• Metal detector
  
• Static Electricity / Negative Ion Detector
  
• Ultrasonic dog whistle
  
• Popular Electronics Ultrasound Detector
  
• An Inexpensive X-ray Machine
  
• Magnetic levitation circuit
  
• PE3342 Programmer Schematic
  
• Schmidt Trigger
  
• u-Blox GPS receiver board
  
• Assorted digital circuits
  
• Basic electronic circuits
  
• Miscellaneous simple circuits
  
• Digital Call Sign Annunciator
  
• Ultrasonic switch
  
• Sound finding cricket with phase detector
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