Do It Yourself Projects #2

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

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

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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

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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

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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

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QSL.NET Advertising Info

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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

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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

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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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