Do It Yourself Projects #4

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

Personal stereo audio amp

Headphone amplifier

1.5W Audio amplifier

Low-level audio amp

10W amplifier

80W amplifier

LM383 12V Amplifier

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

100W Audio amplifier

100W RMS Amplifier

2-Channel Power Amplifier

Push-Pull Class A Amp using type 5687 dual triodes

Push-Pull Class A 2A3 Stereo Amp

Single Ended Class A2 SV811-10 Stereo Amp

Audio amplifier output relay delay

Spatial Distortion Reduction Headphone Amp

HeadBanger Headphone Amp

2W Amplifier

TDA2030 8 Watt amplifier

Headphone distribution amp

Headphone monitor amp

50W audio power amplifier

Bi-Directional 2.4 GHz One Watt Amplifier

Bi-Directional 900Mhz One Watt Amplifier

20 Watt GaAaFET Power on 2.3 GHz

1 Watt 2.3 GHz RF Amplifier Using a MRF2001

2.3 GHz Power Amplifiers

2304 and 3456 MHz Power Amplifiers

High quality exponential VCA

16 Watt amplifier

8 Watt amplifier

Power amp schematic (PDF)

20 Watt Class-A Power Amplifier

El-Cheapo - A Really Simple Power Amplifier

Single Chip 50 Watt / 8 Ohm Power Amplifier

Hi-Fi Headphone Amplifier

100W Guitar Amplifier

Death of Zen (DoZ) - A New Class-A Power Amp

Soft-Start Circuit For Power Amps

Thermo-Fan To Keep Your Amp Cool

Audio Amp Output Power Limiter

55W (Originally 75W) Power Amplifier

300W Subwoofer Power Amplifier

20 Watt / Channel Stereo Power Amplifier

Mini bench amplifier (LM386)

12 Watt Valve Guitar Amp

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Audio Preamp

Microphone amplifier

RIAA phono amplifier

Low impedance microphone amplifier

Dynamic microphone preamplifier

Phono preamp

Masthead preamp

Preamplifier for microphone or guitar use

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

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Miscellaneous Audio

Electronic siren

Two-tone siren

Underwater microphone

Code practice oscillator

Noise generator

Electronic whistle

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

Automatic Charger for Battery Operated Hi-Fi Preamps

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

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

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

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

Surround Sound Decoder Mk2

Audio mixer

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QSL.NET Advertising Info

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Filter

Galaxy Noise Filter

Low-pass active filter

Filter Circuit for the Earthworm Seismic Data Acquisition System

Active 2nd Order Filters

RC Notch Filter (Twin T)

Multiple Feedback Bandpass Filter

CW filters

Self-tune filter

SSB AF filter

Helical Resonator Notch Filter

3KHz low-pass filter plus audio amp (PDF)

Active bandpass filters

Bandpass filters

Butterworth filters

Narrow band audio bandpass filter

Inversal notch and bandpass filter

DC Accurate, Active RC Lowpass Filter

Chebyshev Bandpass Filter

Bandpass filters

Chebyshev / Butterworth filters

Biquad Active Bandpass Filter Schematic

"A" Weighting Filter For Audio Measurements

Multiple Feedback Bandpass Filter

Digital signal processor (DSP) for radio communications

29.85 MHZ bandpass filter schematic

29.85 MHZ notch filter schematic

LC filter design

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Games

Visor cradle serial interface

Electronic coin tosser

Electronic craps game

First response monitor

VCR ping pong game

Video ping pong game

MBC5/CPLD for the GameBoy

GameBoy Camera Parallel Port Interface

Mobile robot (PDF)

PSX controler to PC MIDI converter

Dreamcast PC serial adapter

GameBoy Cart Programmer

Memory game

32 Kb x 8 emulator for the GameBoy

Project: NES to Atari 2600 controller interface

Battery Meter for Pinball Machines

SRX1 (Stephane's Robotic eXperiment 1)

Pine Racecar Victory Judge

Interfacing Sony control stick to Empeg

Electronic Nicad glow plug driver

April Fools LEDs

Pinewood Derby logic

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)

Slot car TV cronograph

Furby reverse-engineered circuit

Sanyo 20EZ monitor Arcade Game (300k ZIP)

Burger Time Arcade Game (500k ZIP)

Dig Dug Arcade Game (800k ZIP)

Frogger Arcade Game (500k ZIP)

Galaga Arcade Game (542k ZIP)

Gyrus Arcade Game (800k ZIP)

Junior Pacman Arcade Game (400k)

Ladybug Arcade Game (335k ZIP)

Mappy Arcade Game (470k ZIP)

Moon Cresta Arcade Game (300k ZIP)

Mr.Do Arcade Game (554k 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

Video game system using PIC18F252 (direct video generation)

Video game system using SX28 (direct video generation)

DIT shutterglasses controller

Tic-tac-toe game using PIC16F628

Archery timer

PIC micro Tetris game

Magic lamp, IR remote control jammer and other fun circuits (PDF)

Lego Mindstorms Double Rotation Sensor

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Medical and Health

Snore alarm electronic device

Heartbeat transducer

ECG Amplifier

EKG/EEG circuit

Radiation Dosage-Rate Meter

Heartbeat monitor

Cranial Electrotherapy Stimulator

Automated crib lights

Jogging timer

Tan timer

Muscular Bio-stimulator

Pedometer

Simple lie detector

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

The ESP SIM (Sound Impairment Monitor)

Respiration system

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Models

Snake throat muscle controller

Handy cricket for robotic applications

Incline Railway Control Circuit

A Receive Signal Decoder

27Mhz toy car receiver

27Mhz toy car transmitter

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

Multi Rocket Launcher

Model rocket launch controller

Pad launch controller for model rockets

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

250-amp Speed Controller for RC cars

Spider robot electronic project page

Two tone train horn

R/C Emergency locator alarm

Remote switch for radio-control aircraft accessories

Radio Control Battery Backup

Glow Plug driver for model engines

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Music

Audible metronome

Visual metronome

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

Colour organ light

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

Vibrato Circuit for Guitar, Steel, Bass, Etc.

MIDI status indicator

Zonk Machine and Treble Booster

Simple line mixer

Simple MIDI tester

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

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 project

MIDI Drum Machine Analog Input Schematic

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

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High in Fiber • No Movies • No MSG • No Animation (well, very little)
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MicroMax Systems Inc.