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
Wednesday, July 09, 2025		 Voltage Inverter35
Stepper Motor Controller30
Yesterday
Tuesday, July 08, 2025		 12VDC To 120VAC Inverter54
FM Transmitter33
Of All Time 12VDC To 120VAC Inverter1,550,196
FM Transmitter1,023,404

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,647 61 *
Car Alarm Arming Horn Beep Canceller bob 141,652 6 *
Wireless Auto Tachometer 349,479 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,012 29 *
Parallel (Printer) Port Interface 294,316 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,079 63 *
3 Channel Spectrum Analyzer 229,286 20
40W Fluorescent Lamp Inverter Bart Milnes 336,147 60 *
Adjustable Strobe Light 316,516 36
Black Light 290,433 29
Colour (Sound) Organ 298,043 36
Electronic Dice NEW! 195,375 10 *
Fantastic Atom Expander 208,322 25
Flash Slave Trigger 227,808 18 *
Infa-Red Remote Control 645,563 216 *
IR Remote Extender NEW! 138,990 3 *
IR Remote Jammer Carl 273,450 110 *
IR Remote Switch NEW! 163,352 9 *
LASER Transmitter/Receiver 425,272 92
LED Chaser 454,262 83 *
LED Metronome NEW! 105,241 3 *
LED Thermometer 212,522 22 *
Light/Dark Detector 311,772 90 *
Simple Colour Organ 142,814 11 *
Strobe Light 281,674 27 *
TRIAC Light Dimmer 561,250 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,385 122 *
Electromagnetic Levitator NEW! 150,154 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,324 214 *
AC Motor Speed Controller 401,156 29 *
Air Flow Detector 257,872 54 *
Digital Keypad Combination Lock 207,702 20
Low Voltage Alarm 235,398 58 *
Pine Racecar Victory Judge 107,883 1 *
Pulse Width Modulation DC Motor Control 663,144 94
Rain Detector 311,397 112 *
Simple Lie Detector 572,693 323
Simple Polarity Tester Dudley LeRoux 171,341 13 *
Simple Servo Controller 228,123 22 *
Simple Touch Switch NEW! 176,200 6 *
Simple Two Speed Contactor DC Motor Controller 211,652 21 *
Stepper Motor Controller 760,027 120 *
Time Delay Relay 563,360 88
Time Delay Relay II jawaharlal@excite.com 253,885 39 *
Touch Switch 296,553 51 *
Video Activated Relay 127,364 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,030 10 *
Water Detector With Sump/Bilge Pump Controller 158,902 18 *
Wire Loop Alarm Alex Meaden 211,490 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 326,164 25 *
12VDC To 120VAC Inverter 1,550,196 691
6V to 12V Converter 536,698 121
Automatic 12V Lead Acid Battery Charger 946,703 248
Automatic Load Sensing Power Switch 173,785 16 *
Car Battery Charger 891,925 159 *
Dual Polarity Power Supply 378,837 84 *
Fixed Voltage Power Supply 318,416 52 *
High Current Power Supply 348,514 66 *
High Voltage High Current Power Supply 271,017 35 *
LASER Power Supply 303,809 28
Portable CD Player Adapter For Car 218,459 12 *
Power Supply 747,748 259 *
Solid State Tesla Coil NEW! 154,068 4
Solid State Tesla Coil/High Voltage Generator 454,115 51
Transformerless Power Supply 470,848 117 *
Voltage Inverter 349,811 51 *
Voltage Inverter II 210,382 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 592,997 182
3 Watt FM Transmitter Rae XL Tkacik 345,369 83 *
50 Watt Amplifier 516,903 74
8 Note Tune Player 146,714 12 *
8 Watt Audio Amp 382,583 67 *
Aircraft Radio Communications Receiver 287,816 50 *
Crystal Radio 166,508 53 *
Digital Volume Control 346,772 47 *
Electronic Stethoscope 329,704 142 *
FET Audio Mixer 351,323 41
FM Transmitter 1,023,404 420
Guitar Fuzz Effect 255,624 54 *
Microphone Mixer Anatoly I. Shikhatov 257,715 26 *
Mono To Stereo Synthesizer oRbEq 141,278 18 *
One Tube Regenerative Radio NEW! 155,653 4 *
Op Amp Radio 398,998 80 *
Single Chip AM Radio NEW! 106,294 4 *
Single Chip FM Radio NEW! 180,505 1 *
Sound Level Meter 349,502 51 *
Stereo Tube Amplifier Weslee Kinsler 275,564 15 *
Tone Control 317,466 31
Transistor Organ 207,351 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,161 27 *
FM Telephone Bug 240,716 57
Phone Busy Indicator 219,869 24 *
Remote Telephone Ringer 123,612 3 *
Ringing Phone Light Flasher 225,959 35 *
Simple Phone Tap Derek Tombrello 389,821 98 *
Telephone Hold Button 134,836 10
Telephone Recorder 222,558 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.