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 Amp97
7 Segment LED Counter26
Yesterday
Sunday, June 28, 2026		 12VDC Fluorescent Lamp Driver89
12VDC To 120VAC Inverter39
Of All Time 12VDC To 120VAC Inverter1,565,529
FM Transmitter1,036,204

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,652 61 *
Car Alarm Arming Horn Beep Canceller bob 146,235 6 *
Wireless Auto Tachometer 355,220 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 169,263 29 *
Parallel (Printer) Port Interface 301,440 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 461,607 63 *
3 Channel Spectrum Analyzer 235,421 20
40W Fluorescent Lamp Inverter Bart Milnes 341,620 60 *
Adjustable Strobe Light 322,614 36
Black Light 297,644 29
Colour (Sound) Organ 304,878 36
Electronic Dice NEW! 201,157 10 *
Fantastic Atom Expander 213,169 25
Flash Slave Trigger 233,523 18 *
Infa-Red Remote Control 652,814 216 *
IR Remote Extender NEW! 144,454 3 *
IR Remote Jammer Carl 279,623 110 *
IR Remote Switch NEW! 168,741 9 *
LASER Transmitter/Receiver 431,920 92
LED Chaser 461,843 83 *
LED Metronome NEW! 110,621 3 *
LED Thermometer 217,344 22 *
Light/Dark Detector 316,809 90 *
Simple Colour Organ 147,698 11 *
Strobe Light 286,746 27 *
TRIAC Light Dimmer 568,467 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 374,427 122 *
Electromagnetic Levitator NEW! 155,234 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 941,648 214 *
AC Motor Speed Controller 409,108 29 *
Air Flow Detector 263,296 54 *
Digital Keypad Combination Lock 212,863 20
Low Voltage Alarm 241,151 58 *
Pine Racecar Victory Judge 112,472 1 *
Pulse Width Modulation DC Motor Control 670,278 94
Rain Detector 317,111 112 *
Simple Lie Detector 579,466 323
Simple Polarity Tester Dudley LeRoux 177,105 13 *
Simple Servo Controller 233,897 22 *
Simple Touch Switch NEW! 182,074 6 *
Simple Two Speed Contactor DC Motor Controller 217,426 21 *
Stepper Motor Controller 769,896 120 *
Time Delay Relay 569,707 88
Time Delay Relay II jawaharlal@excite.com 259,556 39 *
Touch Switch 302,282 51 *
Video Activated Relay 132,070 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 194,616 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! 335,980 25 *
12VDC To 120VAC Inverter 1,565,529 691
6V to 12V Converter 544,184 121
Automatic 12V Lead Acid Battery Charger 955,007 248
Automatic Load Sensing Power Switch 179,397 16 *
Car Battery Charger 899,210 159 *
Dual Polarity Power Supply 385,885 84 *
Fixed Voltage Power Supply 323,766 52 *
High Current Power Supply 355,891 66 *
High Voltage High Current Power Supply 276,964 35 *
LASER Power Supply 309,639 28
Portable CD Player Adapter For Car 223,931 12 *
Power Supply 754,690 259 *
Solid State Tesla Coil NEW! 161,398 4
Solid State Tesla Coil/High Voltage Generator 462,663 51
Transformerless Power Supply 477,045 117 *
Voltage Inverter 358,159 51 *
Voltage Inverter II 216,046 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 599,033 182
3 Watt FM Transmitter Rae XL Tkacik 353,696 83 *
50 Watt Amplifier 523,745 74
8 Note Tune Player 151,597 12 *
8 Watt Audio Amp 390,667 67 *
Aircraft Radio Communications Receiver 294,946 50 *
Crystal Radio 174,061 53 *
Digital Volume Control 353,130 47 *
Electronic Stethoscope 336,751 142 *
FET Audio Mixer 357,084 41
FM Transmitter 1,036,204 420
Guitar Fuzz Effect 262,822 54 *
Microphone Mixer Anatoly I. Shikhatov 263,485 26 *
Mono To Stereo Synthesizer oRbEq 147,382 18 *
One Tube Regenerative Radio NEW! 165,142 4 *
Op Amp Radio 406,088 80 *
Single Chip AM Radio NEW! 111,691 4 *
Single Chip FM Radio NEW! 187,372 1 *
Sound Level Meter 355,654 51 *
Stereo Tube Amplifier Weslee Kinsler 282,409 15 *
Tone Control 323,999 31
Transistor Organ 213,419 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,873 27 *
FM Telephone Bug 245,391 57
Phone Busy Indicator 224,971 24 *
Remote Telephone Ringer 128,365 3 *
Ringing Phone Light Flasher 232,752 35 *
Simple Phone Tap Derek Tombrello 394,992 98 *
Telephone Hold Button 139,412 10
Telephone Recorder 227,303 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.