prof. Jacques Lepot
  ACCUEIL RESSOURCES COURS et DOCUMENTATIONS
Schémas sur le web 
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PC related schematics

  • I2C printer port adaptor
  • RS232C Level Converter
  • PC electrically isolated RS422 interface using SN75176B or MAX485
  • PC electrically isolated RS485 interface using MAX487 or SN75176B
  • Short circuit protected power supply from PC 12V supply
  • Isolated Full Duplex RS232C Interface
  • RS232 DB-9 switch to flip between two serial ports
  • DB-9 Connector to DB-25 (both RS-232)
  • Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25
  • Modem Rockwell RCV336/ACF model V1433VQR ext.
  • Genius Mouse schematics
  • EEPROM programmer
  • Commodore 64 24-bit parallel port interface with 8255
  • Sound Card Interface with Tone Keyer
  • RGB oo Monochrome converter - Matches impedance of PC to CCTV monitor
  • Ericsson phone to PC serial port interface
  • PC serial port receiver
  • Parallel port relay interface
  • ISA 48 I/O digital card
  • PC infrared iRDA interface using TFDS 4500
  • Jupiter card programmer
  • USB to RS232 Dongle
  • 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
  • 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
  • Build your own iRDA SIR Transceiver (Dongle) using MCP2120
  • 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
  • Analog to Digital Conversion (ADC) and Communicating with a PC
  • Temperature sensor for PC
  • Interfacing to an IBM PC/AT keyboard
  • PC interface for point controller
  • Linux Infra-red Remote Control (LIRC)
  • Homebuilt RS232 LCD Interface
  • Compter microphone
  • CCD linear image sensor to PC parallel interface
  • 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
  • RS-232 to TTL cable
  • 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
  • RS232 - Lowe HF-225 interface
  • RS232 to IrDA convertor using Vishay TOIM3232
  • Interfacing PC sound card to SSB rig
  • Supply Derives Power From 3-Wire RS-232 Port
  • 24-line PC digital interface (PDF)

    • PDA interfaces and related schematics

  • Casio interface circuits
  • SHARP palm-top/hand-held to RS232 serial converter
  • Interfacing ultrasonic range finder to BrainStem
  • Hamamatsu UVTron Interface to a BrainStem
  • Casio interface cable
  • Casio organiser hardware
  • 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
  • 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
  • IBM PC keyboard to PalmPilot interface
  • Aladin interface using op-amp
  • Wireless local network for PalmPilot (large PDF)

    • Power supplies and control schematics

  • Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VAC
  • 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
  • Alkaline battery charger
  • Alternative power source for Magellan GPS receivers
  • 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
  • Intelligent NiMH/NiCd switched mode fast 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
  • 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
  • Nagative voltage generation using 555 timer
  • 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
  • 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
  • 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
  • Power control for arc welders and other inductive loads
  • Charger for gel lead acid batteries
  • Nicad battery cycler
  • Battery Characterizer
  • Nicad Battery Discharger/Capacity Indicator
  • 200 Watt Modified PC Power Supply 13.5 Volt 14 Amp

    • Radio-frequency schematics (also see Transmitters)

  • 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
  • CW RECEIVER 40/80 meter CW receiver
  • TRF AM Receiver circuit
  • WLW 500KW Transmitter Schematic
  • AM-Receiver for Aircraft communication (118.250MHz)
  • AM receiver for aircraft communications
  • 45-860MHz Radio receiver based on UV916-tuner
  • 80 Meter CW ARDF receiver
  • Four channel RF remote control
  • CW zero beat indicator (PDF)
  • Build your own VLF Receiver
  • Receiver building blocks
  • Simple wireless radio data link
  • RX3302 receiver module schematic
  • Superregenerative 27MHz receiver
  • 49MHz walkie-talkie
  • Convert 2m VHF FM PMR transceiver Motorola Radius M110 into an amateur radio
  • Vibrating pocket bug detector
  • 2MHz RF Oscillator
  • 50-150MHz Overtone Oscillator
  • Simple Op-Amp Radio
  • UHF - 100W Transistorized amplifier
  • 50MHz Converter
  • 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
  • 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
  • 23cm Data Transceiver
  • External antenna for the GPS-38, Magellan 2000, or Eagle Explorer GPS receivers
  • 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
  • 7MHz SSB Transceiver
  • DSBSC (Double Side Band Supressed Carrier)
  • Frequency Synthesizer
  • Digital Automatic Gain Control (AGC)
  • Four Channel Wireless Transmitter and Receiver
  • Talking receiver
  • PLL synthesizing oscillator (1)
  • PLL synthesizing oscillator (2)
  • PLL synthesizing oscillator (3)
  • 2N2222 40 Meter CW/DSB Transceiver
  • Yaesu FT-736R doppler compensation
  • 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
  • Huge LED Antenna Direction Display (part 1)
  • Huge LED Antenna Direction Display (part 2)
  • 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
  • 23cm Wide-Band FM data transceiver for high-speed packet-radio
  • VLF radio receiver schematic
  • 5 watt, 80 meter QRP CW Transceiver
  • How to Build a 300MHz AM, RF Remote Control System
  • RF Modem Robotics Project
  • PLL FM transmitter
  • ICOM CI-V interface with RS232 RTS to PTT
  • 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
  • Radio Control Electric Switch
  • 56K RF Modem
  • 80M ARDF direction finder

    • Solar-powered schematics

  • Sun tracking circuit for solar arrays
  • Solar power recharger
  • Solar power supply
  • Solar charge controller
  • Solar robots
  • Solar Tracker
  • 1381 solar engine
  • D1 solar engine
  • FLED solar engine
  • PM1 solar engine
  • 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

    • Telephone and intercom related schematics

  • Telephone recording circuit
  • 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
  • Telephone interfacing / caller ID using a PIC microcontroller
  • Home made PBX / PABX
  • Ringing Phone Light Flasher
  • Phone Busy Indicator
  • FM Telephone Bug
  • Cut Phone Line Detector
  • Simple Phone Tap
  • Telephone Hold Button
  • Telephone Recorder
  • 300 baud modem circuit schematic
  • DTMF Generator/Decoder
  • Interface cables for various cell phones
  • 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
  • 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
  • Greek telecard reader
  • Phone ring circuit schematic
  • Cut phone line detector
  • Telephone autodialler
  • Taxi phone automatic dialler

    • Test equipment schematics

  • Audible continuity tester
  • Wire tracer
  • Signal generator for signal tracer
  • Electronic level
  • Digital volt meter
  • Adjustable continuity tested
  • Frequency counter
  • Tri-Waveform Generator
  • 220V live wire-in-wall scanner
  • 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
  • Automatic stud detector
  • Capacitance meter
  • Capacitance meter
  • AC Line Current Detector
  • Triangle and Squarewave Generator
  • Signal tracer / injector
  • Voltage probe
  • Live line detector
  • 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)
  • 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
  • Simple light sensor adapter for oscilloscope
  • Time Domain Reflectometer (TDR)
  • 40MHz frequency counter using Atemel AVR 2312 microcontroller
  • 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)
  • 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
  • Capacitance meter that connects to multimeter
  • Transistor tester and signal injector
  • Continuity tester
  • Square wave oscillator (555)
  • 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
  • Field strength meter for the 137 kHz band
  • In-circuit electrolytic tester
  • PIC logic probe with pulser

    • Timing, oscillators etc. schematics

  • Budget timer
  • Long period timer
  • 555 time delay circuit
  • Low frequency clock
  • 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
  • GPS receiver clock circuit
  • Time Delay Relay
  • Time Delay Relay
  • Wide-swing Variable Crystal Oscillator
  • Circuit that momentarily closes a pair of contacts at long intervals
  • 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)
  • Timer based on Microchip PIC16F628
  • Push Button Switch Debouncer
  • Square wave oscillator
  • 5 to 30 Minute Timer
  • NE555 Basic Monostable
  • Mini DDS (Direct Digital Synthesis)
  • Astable Multivibrator
  • High Precision GPS/TV controlled Reference Oscillator
  • TV based Receiver for a Standard Frequency Generator
  • AD9852 DDS schematic
  • A GPS receiver based frequency standard
  • Monostable multivibrator
  • Clock generator
  • 555 Timer Tutorial + Circuits
  • Versatile electronic timer

    • Transmitter schematics

  • Li'l 7 AM Transmitter Schematic
  • Wireless microphone
  • XTAL locked tone transmitter
  • AM oscillator for wireless microphones
  • Wireless microphone
  • 1W CW Transmitter
  • 433MHz transmitter using SAW resonator
  • 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
  • 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
  • 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

    • Video related schematics

  • Video Clock Superimposer
  • Video clock superimposer using PIC16C711
  • Simple AV (audio / video) wireless transmitter
  • Audio / video distribution amplifier
  • 10GHz video link
  • Experimental macrovision remover
  • 8 x 8 Audio-video switch
  • VHF/UHF TV modulator
  • LH0032 video amplifier
  • LM359N video amplifier
  • Macrovision code remover
  • 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
  • Color Bar Generator
  • Microcontroller test pattern generator
  • NTSC Video Distribution Amplifier
  • Commodore RF modulator
  • Video signal edge enhancement
  • Video amplifier
  • Video/Audio Wireless Transmitter
  • 4 Stage 555 Timer for Video Cam Control
  • Digital volt meter with video output
  • 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
  • AVR (AT90S2313) composite PAL colour bar generator
  • Homebuilt video digitizer Mark I
  • Homebuilt video digitizer Mark II
  • TV transmitter (PDF)
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