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
Tuesday, July 08, 2025		 Voltage Inverter6
LASER Power Supply6
Yesterday
Monday, July 07, 2025		 Infa-Red Remote Control55
12VDC To 120VAC Inverter48
Of All Time 12VDC To 120VAC Inverter1,550,112
FM Transmitter1,023,346

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,627 61 *
Car Alarm Arming Horn Beep Canceller bob 141,630 6 *
Wireless Auto Tachometer 349,456 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 164,991 29 *
Parallel (Printer) Port Interface 294,282 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,058 63 *
3 Channel Spectrum Analyzer 229,259 20
40W Fluorescent Lamp Inverter Bart Milnes 336,126 60 *
Adjustable Strobe Light 316,484 36
Black Light 290,398 29
Colour (Sound) Organ 298,015 36
Electronic Dice NEW! 195,343 10 *
Fantastic Atom Expander 208,309 25
Flash Slave Trigger 227,777 18 *
Infa-Red Remote Control 645,516 216 *
IR Remote Extender NEW! 138,960 3 *
IR Remote Jammer Carl 273,431 110 *
IR Remote Switch NEW! 163,322 9 *
LASER Transmitter/Receiver 425,253 92
LED Chaser 454,236 83 *
LED Metronome NEW! 105,215 3 *
LED Thermometer 212,503 22 *
Light/Dark Detector 311,752 90 *
Simple Colour Organ 142,793 11 *
Strobe Light 281,662 27 *
TRIAC Light Dimmer 561,214 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,344 122 *
Electromagnetic Levitator NEW! 150,124 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,281 214 *
AC Motor Speed Controller 401,126 29 *
Air Flow Detector 257,845 54 *
Digital Keypad Combination Lock 207,687 20
Low Voltage Alarm 235,371 58 *
Pine Racecar Victory Judge 107,863 1 *
Pulse Width Modulation DC Motor Control 663,118 94
Rain Detector 311,375 112 *
Simple Lie Detector 572,668 323
Simple Polarity Tester Dudley LeRoux 171,313 13 *
Simple Servo Controller 228,099 22 *
Simple Touch Switch NEW! 176,168 6 *
Simple Two Speed Contactor DC Motor Controller 211,629 21 *
Stepper Motor Controller 759,970 120 *
Time Delay Relay 563,330 88
Time Delay Relay II jawaharlal@excite.com 253,863 39 *
Touch Switch 296,530 51 *
Video Activated Relay 127,352 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,011 10 *
Water Detector With Sump/Bilge Pump Controller 158,875 18 *
Wire Loop Alarm Alex Meaden 211,463 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 326,133 25 *
12VDC To 120VAC Inverter 1,550,112 691
6V to 12V Converter 536,661 121
Automatic 12V Lead Acid Battery Charger 946,652 248
Automatic Load Sensing Power Switch 173,769 16 *
Car Battery Charger 891,889 159 *
Dual Polarity Power Supply 378,805 84 *
Fixed Voltage Power Supply 318,393 52 *
High Current Power Supply 348,490 66 *
High Voltage High Current Power Supply 270,996 35 *
LASER Power Supply 303,783 28
Portable CD Player Adapter For Car 218,441 12 *
Power Supply 747,727 259 *
Solid State Tesla Coil NEW! 154,036 4
Solid State Tesla Coil/High Voltage Generator 454,074 51
Transformerless Power Supply 470,822 117 *
Voltage Inverter 349,761 51 *
Voltage Inverter II 210,354 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 592,966 182
3 Watt FM Transmitter Rae XL Tkacik 345,344 83 *
50 Watt Amplifier 516,869 74
8 Note Tune Player 146,689 12 *
8 Watt Audio Amp 382,538 67 *
Aircraft Radio Communications Receiver 287,793 50 *
Crystal Radio 166,478 53 *
Digital Volume Control 346,739 47 *
Electronic Stethoscope 329,671 142 *
FET Audio Mixer 351,291 41
FM Transmitter 1,023,346 420
Guitar Fuzz Effect 255,589 54 *
Microphone Mixer Anatoly I. Shikhatov 257,681 26 *
Mono To Stereo Synthesizer oRbEq 141,251 18 *
One Tube Regenerative Radio NEW! 155,601 4 *
Op Amp Radio 398,964 80 *
Single Chip AM Radio NEW! 106,266 4 *
Single Chip FM Radio NEW! 180,464 1 *
Sound Level Meter 349,476 51 *
Stereo Tube Amplifier Weslee Kinsler 275,534 15 *
Tone Control 317,435 31
Transistor Organ 207,333 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,136 27 *
FM Telephone Bug 240,696 57
Phone Busy Indicator 219,840 24 *
Remote Telephone Ringer 123,593 3 *
Ringing Phone Light Flasher 225,940 35 *
Simple Phone Tap Derek Tombrello 389,805 98 *
Telephone Hold Button 134,817 10
Telephone Recorder 222,547 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.