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UTILS FOR INFRARED

• IR remote control system for PC
• IR Receiver (Amplitude Modulated IR)
• IR Transmitter for Audio (Amplitude Modulated IR)
• IR remote control
• Infrared body heat detector
• Stereo IR audio receiver
• General purpose IR receiver
• Wireless IR headphone transmitter
• Wireless IR headphone receiver
• 40KHz light receiver (PDF)
• 40KHz TV-VCR repeater (PDF)
• 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
• IR Ranging
• Pyroelectric Infrared Sensor
• Simple IR transmitter circuit
• Simple infra-red detector
• IR remote control extender
• IR remote control tester
• Infrared repeater
• 40khz IR Tester
• 555 timer 40khz IR Oscillator
• IR detector / emitter
• Implementing Infrared Object Detection
• Cheap 40KHz clock
• Stable 40KHz clock
• Serial driven IR remote control
• IR remote transponder
• Infrared gate detector
• Infrared relay with relay output

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LASER

• Laser power supply
• Laser transmitter/receiver
• Pulsed double-heterostructure laser driver
• IR Laser light detector
• Light beam receiver for laser pistols
• 12V supply for He-Ne laser
• Laser diode transmitter
• 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)
• Experimental laser data link

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LED CIRCUITS

• 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
• Winking LEDs
• LED flashing light
• LED initials
• LED chaser
• 7 Segment LED Counter
• LED Flasher
• LED pulser with audible output
• IR Illuminator
• Flashing Christmas LED display
• ICL7660 LED flasher
• 1.5V LED flasher B (PDF)
• Low current LED flasher (PDF)
• 1.5V LED flasher A (PDF)
• Flashing LED advertising badge (PDF)
• Pulsed LED test circuit (PDF)
• Low battery voltage flasher (PDF)
• Adjustable flashing LED
• LED Audio VU Meter
• LM3909 LED flasher

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MICROCONTROLER

• Z80 core #1- Z80 CPU and memory (PDF)
• Z80 core #2- Z80 CTC and SIO
• Z80 core #3- RS-232 drivers for the SIO
• RS485-Version of the SAB80C535-Microcontrollerboard
• AT89C2051/4051scanning 7-segment display and keypad
• AT89C2051/4051 Driving dot LED
• AT89C2051/4051stepper motor interface
• AT89C2051/4051connecting dumb terminal
• Simple RS232C Level Converter using Transistors
• C-52 EVB Robot Controller
• Mains clock controller using AT89C2051
• AT89C2051/4051 Easy-Downloader
• AT89C51/52/55 Easy-Downloader
• PIC16F84 programmer
• PIC16F84 miniature real-time controller
• Isolated RS232 for PIC16F84
• PIC16F84 debugging terminal
• MiniLOGGER V1.0
• Atmel 89C Series Flash Microcontroller Programmer
• AT89C2051 real-time controller
• PIC12C508 Night-light saver
• AT89C2051 Night light saver
• Atmel 8051 Flash Based-Microcontroller Programmer
• AT89C2051 Digital thermometer and clock
• 12C508 Smart Lock
• PIC controlled DDS VFO, 0 to 6 MHz
• PIC16F84 line following robot
• Embedded controller based on MC68HC11F1
• PIC16F84 mechanically scanned clock
• EPROM burner
• 68HC11 stepper motor control
• Serial to parallel converter using the AT89C2051
• AT89C2051 serial COMs to LED driver
• 101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU
• DTMF tone decoder using Basic Stamp
• A Scenix (and PIC) Programmer
• Long-period watchdog timer
• Generate video signals in real-time using a PIC16F84
• PIC Project #1 - RS232 to I2C Interface
• Talking YODA project (PIC16C84)
• PIC16F84/PIC16F87x-In-System-Programmer
• PIC16F84 Based Morse Code Reader
• PICADC - a free, PIC based "intelligent" A/D converter
• AT89C2051 line-follower robot
• PIC16F84 sound controlled Christmas lights
• Convenient PIC module
• Spread spectrum transceiver controlled by PIC
• PIC16C84 VT-52 Emulator for Linux
• Temperature controlled based on AT89CX051
• 2-wire LCD interface using PIC16CF84
• PIC R/C Servo Controller
• Microprocessor RS-232 Reset
• A PIC-Based Keyboard Emulator
• ScanMate audio activated recorded
• Remote control encoder/decoder with PIC16C620 & PIC12C508
• Electronic door codelock with PIC16F84
• Automatic door opener with PIC12C508
• Picxie 2 - 8x8 Animated LED Signboard (PIC16F84) Picxie 2 - 8x8 Animated LED Signboard
• PIC-FC1 Frequency Counter

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ABOUT PC

• I2C printer port adaptor
• RS232C Level Converter
• Isolated Full Duplex RS232C Interface
• PC Serial Port Receiver
• Parallel Port Relay Interface Circuit
• ISA 8-bit output card
• PC based 7-segment rolling display
• Parallel print capture system
• PC serial port receiver
• Parallel port relay interface
• Parallel (Printer) Port Interface
• RS-232 line monitor and loopback cables
• A Serial Infrared Remote Controller
• Interfacing 16x2 character :LCD to parallel port
• 8254 Timer and Counter Board
• Serial to ECP interface
• Parallel port interface box
• General purpose 48-bit ISA parallel I/O card
• 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
• Parallel port servo controller
• 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
• DC-DC Power Supply from car 12V battery to PC motherboard
• Linux Infra-red Remote Control (LIRC)
• Compter microphone
• Laptop Computer Serial Port Power Booster
• HamComm Interface
• Hi-Fi PC Speaker System
• IDE hard-disk interface for Amiga 500
• SmartCard PC emulator
• Parallel port ADC/DAC
• Parallel port ADC using ADC0804
• High speed 20MSPS ADC interface
• 9-pin null modem cable
• 24-bit parallel port interface with 8255 for Commodore computer
• 24-line PC digital interface (PDF)
• SPDIF-interface to AudioPCI

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POWER SUPPLY

• Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VAC
• 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
• 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
• Basic increase in DC voltage
• Power Tool Torque Control
• DC-DC converter
• A Bench PSU (0-15v 0-3A)
• Easy bench PSU
• Variable DC power supply
• Using the 78xx Series Voltage Regulators
• 6V to 12V Converter
• Tesla coil / HV generator
• 12VDC To 120VAC Inverter
• 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
• 1A Variable Regulated Power Supply
• 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
• Power reminder beeper (PDF)
• Unplugged power cord alarm
• Machine power loss beepter (PDF)
• HV supply: 12VDC in, 12KV out
• Generating -5VDC from +5VDC
• Filtering PC bus POWER
• Adjustable power supply using LM317
• Simple +5V power supply circuit
• 12V 30A power supply
• Dual regulated power supply
• Fuse blown indicator
• Gyrator circuit
• Variable power supply
• Nicad battery charger
• Regulated 12V supply
• Unregulated power supply
• 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/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
• Charger for gel lead acid batteries
• Nicad Battery Discharger/Capacity Indicator

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RF THINGS

• Simple Op-Amp Radio
• TRF AM Receiver circuit
• Crystal radio
• Automatic message sender for CB
• RF Sensing relay driver
• Vibrating pocket bug detector
• 2MHz RF Oscillator
• 50-150MHz Overtone Oscillator
• NASA TURFTS - TDRSS User RF Test Set
• Remote powered antenna pre-amplifier
• 10K RF probe
• IF amplifiers
• VHF 144MHz to HF 14MHz Transverter
• VHF harmonic oscillator (or QRP VHF FM TX) LO for transverter
• Modify a cheap MW radio for 1.8MHz CW/SSB
• Direction finding system
• An HF (15khZ UPWARDS) DC receiver
• One transistor hf regen receiver.
• Modify a cheap MW to cover any HF band
• Synthesized HF receiver
• TBA120 NBFM/FSK/RTTY RX for HF/VHF
• TDA7000 VHF WB FM RX
• Receivers for HF and VHF USING ZN414
• 10W HF Power Amplifier (linear)
• 500W linear HF amplifier.
• Step VFO
• A wide B/W 3 watt QRP HF linear amplifier
• A phasing method SSB exciter
• 500mW HF Linear Amplifier using 2N2222
• Generic VHF Power Amplifiers
• The Baycom packet modem
• Simple CW filters for homebrew QRP receivers
• 10.7MHz (455KHz) TTL FM demodulator
• G8TGL RTTY Teleprinter Terminal Unit
• The HamComm RTTY/CW/ASCII modem/Interface
• CMOS AF/RF Synthesizer (37Hz - 4MHz)
• HF/VHF PCB VSWR bridge
• HF Linear RF power amplifier
• 100W HF Linear AMP
• 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
• 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
• Bug detector
• 175KHz inductive pulse receiver (PDF)
• 200-400 MHz voltage controlled oscillator
• Icom CT-17 Logging & Control Interface Level Converter
• AM/FM/SW active antenna
• RF Sniffer <.5 to >500 MHz
• Four Channel Wireless Transmitter and Receiver
• Wireless event receiver
• Talking receiver
• Wireless motion detector
• 418MHz Control RX/TX
• AM receiver
• Field strength meter
• MW preamplifier
• Simple field strength meter
• 4 band double-tuned preselector
• ZN414 AM receiver
• ZN414 shortwave receiver
• Phased lock loop schematic
• Receiver
• 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
• 50MHz Assistant (Preamp & Power Amp.)
• Bug detector
• Basic RF oscillator
• Superregenerative 27MHz receiver
• Radio Control Electric Switch

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SOLAR ENERGY

• Sun tracking circuit for solar arrays
• Solar power recharger
• Solar power supply
• AA battery solar charger
• Solar Panel Charge Controller / Low Voltage Disconnect Circuit
• Solar Panel Current Meter
• Solar cell Nicad charger

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TRANSMITTER

• Micro Power AM Broadcast Transmitter
• FM Beacon Transmitter (88-108 MHz)
• Portable 40W CW transmitter
• Spark-gap transmitter
• Wireless microphone
• A 3m (100 MHz) small bug
• Basic FM Transmitter
• One valve CW transmitter (Battery)
• 250mW HF bands CW TX
• High Power VHF FM Wireless Microphone (v5)
• A simple VHF FM 2-metre transmitter
• QRP SSB HF transmitter
• FM transmitter
• Two Valve 40m CW Transmitter
• Frequency agile 80m CW QRP transmitter
• 80 metre DSB transmitter
• Wireless microphone
• XTAL locked tone transmitter
• AM oscillator for wireless microphones
• Wireless microphone
• 1W CW Transmitter
• 175KHz inductive pulse transmitter (PDF)
• Small Radio Transmitter
• FM Telephone Transmitter
• Micropower Event Transmitter
• FM transmitter
• 4 transistor transmitter
• FM transmitter
• Op-amp based FM 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
• 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






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