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Do It Yourself Projects #2

Posted 25 May 2005
Updated 27 May 2005

Here are some of the "Best of the Best" Projects and "How-To" Pages I've wandered upon in my treks across the Net.


Alarms & Security

  • Proximity alarm
  • Electronic lock
  • Electronic door codelock (PIC16F84)
  • Moisture alarm
  • Fridge door alarm
  • Ultrasonic remote control & alarm system
  • Wire loop alarm
  • Digital entry lock
  • Proximity switch
  • Toxic Gas Detector
  • Door knob alarm (PDF)
  • Water seepage alarm (PDF)
  • Micro-power over temperature alarm (PDF)
  • Personal silent alarm system
  • Active IR motion detector
  • A Basic RF Transmitter for PIR Sensors
  • PIR motion detector
  • Simple alarm system
  • Automatic door opener using PIC12C508
  • Home security project
  • 5 Zone alarm circuit
  • Miniature loop alarm
  • Novel Buzzer
  • Gate alarm circuit
  • Modular Burglar Alarm
  • Motorcycle alarm
  • Enhanced 5 Digit Alarm Keypad
  • Enhanced 4 Digit Alarm Keypad
  • RF Alarm
  • Single Zone Alarm
  • Water Activated Alarm
  • Water level alarm
  • Perimeter monitor
  • Digital combination lock
  • Alarm control keypad
  • Almost Ultrasonic Motion Sensor
  • Touch activated alarm system
  • Combination Lock (PIC16F84)
  • Low power RFID transponder

  • Automotive

  • Electronic auto stethoscope
  • Turn signal alarm
  • Motorcycle turn-signal system
  • Cigarette lighter 9V adaptor
  • Analog Tachometer for Gasoline Engines
  • Headlight On reminder with Light
  • Adaptive Windscreen Wiper Control
  • Car clock
  • Car message display
  • Car interval wiper
  • Safety indicator light
  • Speed limit alert
  • Grand Cherokee Off-Highway Lights
  • Engine control unit schematics
  • Portable CD Player Adapter For Car
  • Car battery charger
  • Wireless Auto Tachometer
  • Alternator Signal Detector
  • Automotive alarm system
  • Road ice alarm
  • Automotive Anti-Lock Brake Control Driver
  • Headlight reminder
  • Breath Alcohol Tester controlling a car ignition system
  • Simple car battery charger
  • Parking sonar
  • Fuel injector pulse width monitor
  • BMW R Series Motorcycle Regulator Schematic
  • 80188XL Engine Tachometer
  • Integrate Fuel Pump Wire Security Cut Off with a Turbo Timer
  • Simple Car Preamplifier and Artificial Earth
  • FCD (Fuel Cut Defencer)
  • Interface between GM's 5 Volt 8192 baud ALDL data stream and a PC serial port
  • 5301 wideband fuel mixture display
  • Wide Band Fuel Mixture Display
  • 3rd brake light
  • 12V to 9V car coverter
  • Car Nicad charger
  • Combination lock for car liftgate
  • BMW motorcycle side stand protection mod

  • LED

  • Big 7-segment LED display board with SPI interface
  • LED Flasher
  • LED pulser with audible output
  • IR Illuminator
  • Flashing Christmas LED display
  • ICL7660 LED flasher
  • LM3909 replacement using discrete components
  • Color fade
  • LEDs shimmer randomly as though on fire
  • LED power supplies for AA cells
  • 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)
  • 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
  • Robot Beacon rotating light using PIC12C508
  • LM3909 LED flasher
  • Animated LED signboard (PIC16C84)
  • Picxie 2 - 8x8 Animated LED Signboard

  • Radio Frequency

  • 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



  • Test Equipment

  • 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

  • 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

  • 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


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