Electronic Circuits

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Here are some neat circuits you might want to try. The schematics and printed circuit board patterns are GIF's, and may show up different on some browsers. You might want to save the images (especially the PC board patterns) to your hard drive, load them into a photo editor (Photoshop, Paint Shop Pro, The GIMP, etc.) and adjust the size before you transfer the pattern to a board. Printed circuit board patterns are available possible. This page is always under construction and there will be new additions from time to time. Some of these circuits were designed by me, most are not. Whenever possible I have tried to credit the author of a circuit but since many of these circuits are from my personal collection that I have gathered over a period of many years, this information is not always available.

You can rank circuits according to how much you like a circuit by clicking on the lightning bolt icons. These ranks can be based on how much you like a circuit, whether a circuit worked or didn't work for you, or how useful you found a circuit. Additionally you can add your own comments at the bottom of each circuit by filling out the form.

Circuit Catagories

Circuits are divided into categories as listed below.

Catagory Circuits
Auto 3
Computer 2
Light/Laser 21
Major Projects 2
Other 21
Power Supply 18
Sound/Radio 22
Telephone 8

Some circuits in this list have little astrisk (*) markers beside them which give a basic amount of information regarding whether the circuit has been designed, tested or modified by the webmaster.

Marker Description
* The circuit has not been tested by me. Therefore, I will offer no gaurantee that they will work.
* This circuit has been designed by me.
* This circuit was not designed by me, but was modified by me.

Most Popular Circuits

The most popular circuits of today, yesterday and all time can be found below.

When Circuit Views
Today
Monday, June 29, 2026		 8 Watt Audio Amp82
7 Segment LED Counter24
Yesterday
Sunday, June 28, 2026		 12VDC Fluorescent Lamp Driver89
12VDC To 120VAC Inverter39
Of All Time 12VDC To 120VAC Inverter1,565,525
FM Transmitter1,036,204

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,648 61 *
Car Alarm Arming Horn Beep Canceller bob 146,232 6 *
Wireless Auto Tachometer 355,214 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 169,262 29 *
Parallel (Printer) Port Interface 301,436 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 461,604 63 *
3 Channel Spectrum Analyzer 235,418 20
40W Fluorescent Lamp Inverter Bart Milnes 341,618 60 *
Adjustable Strobe Light 322,611 36
Black Light 297,638 29
Colour (Sound) Organ 304,874 36
Electronic Dice NEW! 201,156 10 *
Fantastic Atom Expander 213,165 25
Flash Slave Trigger 233,518 18 *
Infa-Red Remote Control 652,812 216 *
IR Remote Extender NEW! 144,453 3 *
IR Remote Jammer Carl 279,620 110 *
IR Remote Switch NEW! 168,738 9 *
LASER Transmitter/Receiver 431,917 92
LED Chaser 461,841 83 *
LED Metronome NEW! 110,620 3 *
LED Thermometer 217,342 22 *
Light/Dark Detector 316,809 90 *
Simple Colour Organ 147,696 11 *
Strobe Light 286,744 27 *
TRIAC Light Dimmer 568,467 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 374,426 122 *
Electromagnetic Levitator NEW! 155,234 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 941,646 214 *
AC Motor Speed Controller 409,105 29 *
Air Flow Detector 263,293 54 *
Digital Keypad Combination Lock 212,862 20
Low Voltage Alarm 241,145 58 *
Pine Racecar Victory Judge 112,470 1 *
Pulse Width Modulation DC Motor Control 670,276 94
Rain Detector 317,109 112 *
Simple Lie Detector 579,465 323
Simple Polarity Tester Dudley LeRoux 177,103 13 *
Simple Servo Controller 233,896 22 *
Simple Touch Switch NEW! 182,070 6 *
Simple Two Speed Contactor DC Motor Controller 217,423 21 *
Stepper Motor Controller 769,895 120 *
Time Delay Relay 569,703 88
Time Delay Relay II jawaharlal@excite.com 259,553 39 *
Touch Switch 302,281 51 *
Video Activated Relay 132,067 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 194,611 10 *
Water Detector With Sump/Bilge Pump Controller 164,392 18 *
Wire Loop Alarm Alex Meaden 216,421 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 335,973 25 *
12VDC To 120VAC Inverter 1,565,525 691
6V to 12V Converter 544,183 121
Automatic 12V Lead Acid Battery Charger 955,002 248
Automatic Load Sensing Power Switch 179,394 16 *
Car Battery Charger 899,210 159 *
Dual Polarity Power Supply 385,884 84 *
Fixed Voltage Power Supply 323,763 52 *
High Current Power Supply 355,886 66 *
High Voltage High Current Power Supply 276,962 35 *
LASER Power Supply 309,637 28
Portable CD Player Adapter For Car 223,926 12 *
Power Supply 754,689 259 *
Solid State Tesla Coil NEW! 161,397 4
Solid State Tesla Coil/High Voltage Generator 462,662 51
Transformerless Power Supply 477,043 117 *
Voltage Inverter 358,155 51 *
Voltage Inverter II 216,043 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 599,022 182
3 Watt FM Transmitter Rae XL Tkacik 353,694 83 *
50 Watt Amplifier 523,742 74
8 Note Tune Player 151,596 12 *
8 Watt Audio Amp 390,652 67 *
Aircraft Radio Communications Receiver 294,946 50 *
Crystal Radio 174,060 53 *
Digital Volume Control 353,130 47 *
Electronic Stethoscope 336,751 142 *
FET Audio Mixer 357,083 41
FM Transmitter 1,036,204 420
Guitar Fuzz Effect 262,821 54 *
Microphone Mixer Anatoly I. Shikhatov 263,484 26 *
Mono To Stereo Synthesizer oRbEq 147,380 18 *
One Tube Regenerative Radio NEW! 165,140 4 *
Op Amp Radio 406,087 80 *
Single Chip AM Radio NEW! 111,691 4 *
Single Chip FM Radio NEW! 187,370 1 *
Sound Level Meter 355,653 51 *
Stereo Tube Amplifier Weslee Kinsler 282,404 15 *
Tone Control 323,995 31
Transistor Organ 213,418 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,872 27 *
FM Telephone Bug 245,390 57
Phone Busy Indicator 224,966 24 *
Remote Telephone Ringer 128,362 3 *
Ringing Phone Light Flasher 232,749 35 *
Simple Phone Tap Derek Tombrello 394,991 98 *
Telephone Hold Button 139,411 10
Telephone Recorder 227,302 55 *

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All material marked as mine is property of Aaron Cake. You may, however, distribute it as much as you want, with or without credit to me. Just don't claim credit for it yourself, and it would be nice if you included a link back to my page. All other material is property of its authors.