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
Thursday, March 05, 2026		 12V To 24V DC-DC Converter17
Voltage Inverter11
Yesterday
Wednesday, March 04, 2026		 12VDC To 120VAC Inverter48
Computerize Your Room/Home37
Of All Time 12VDC To 120VAC Inverter1,561,000
FM Transmitter1,032,037

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,274 61 *
Car Alarm Arming Horn Beep Canceller bob 144,938 6 *
Wireless Auto Tachometer 353,686 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,969 29 *
Parallel (Printer) Port Interface 299,440 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,615 63 *
3 Channel Spectrum Analyzer 233,651 20
40W Fluorescent Lamp Inverter Bart Milnes 340,141 60 *
Adjustable Strobe Light 320,876 36
Black Light 295,614 29
Colour (Sound) Organ 302,940 36
Electronic Dice NEW! 199,445 10 *
Fantastic Atom Expander 211,802 25
Flash Slave Trigger 231,969 18 *
Infa-Red Remote Control 650,613 216 *
IR Remote Extender NEW! 142,956 3 *
IR Remote Jammer Carl 277,798 110 *
IR Remote Switch NEW! 167,254 9 *
LASER Transmitter/Receiver 430,001 92
LED Chaser 459,619 83 *
LED Metronome NEW! 108,999 3 *
LED Thermometer 215,933 22 *
Light/Dark Detector 315,436 90 *
Simple Colour Organ 146,328 11 *
Strobe Light 285,303 27 *
TRIAC Light Dimmer 566,150 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,402 122 *
Electromagnetic Levitator NEW! 153,716 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 938,987 214 *
AC Motor Speed Controller 407,084 29 *
Air Flow Detector 261,668 54 *
Digital Keypad Combination Lock 211,419 20
Low Voltage Alarm 239,570 58 *
Pine Racecar Victory Judge 111,164 1 *
Pulse Width Modulation DC Motor Control 668,372 94
Rain Detector 315,407 112 *
Simple Lie Detector 577,721 323
Simple Polarity Tester Dudley LeRoux 175,514 13 *
Simple Servo Controller 232,342 22 *
Simple Touch Switch NEW! 180,498 6 *
Simple Two Speed Contactor DC Motor Controller 215,740 21 *
Stepper Motor Controller 767,274 120 *
Time Delay Relay 567,852 88
Time Delay Relay II jawaharlal@excite.com 258,043 39 *
Touch Switch 300,682 51 *
Video Activated Relay 130,754 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,847 10 *
Water Detector With Sump/Bilge Pump Controller 162,810 18 *
Wire Loop Alarm Alex Meaden 215,024 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 333,605 25 *
12VDC To 120VAC Inverter 1,561,000 691
6V to 12V Converter 542,011 121
Automatic 12V Lead Acid Battery Charger 952,465 248
Automatic Load Sensing Power Switch 177,776 16 *
Car Battery Charger 897,209 159 *
Dual Polarity Power Supply 383,995 84 *
Fixed Voltage Power Supply 322,316 52 *
High Current Power Supply 353,972 66 *
High Voltage High Current Power Supply 275,325 35 *
LASER Power Supply 307,928 28
Portable CD Player Adapter For Car 222,411 12 *
Power Supply 752,593 259 *
Solid State Tesla Coil NEW! 159,363 4
Solid State Tesla Coil/High Voltage Generator 460,056 51
Transformerless Power Supply 475,442 117 *
Voltage Inverter 355,982 51 *
Voltage Inverter II 214,422 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,441 182
3 Watt FM Transmitter Rae XL Tkacik 351,404 83 *
50 Watt Amplifier 521,951 74
8 Note Tune Player 150,209 12 *
8 Watt Audio Amp 388,288 67 *
Aircraft Radio Communications Receiver 292,894 50 *
Crystal Radio 172,013 53 *
Digital Volume Control 351,476 47 *
Electronic Stethoscope 334,427 142 *
FET Audio Mixer 355,410 41
FM Transmitter 1,032,037 420
Guitar Fuzz Effect 260,846 54 *
Microphone Mixer Anatoly I. Shikhatov 261,863 26 *
Mono To Stereo Synthesizer oRbEq 145,574 18 *
One Tube Regenerative Radio NEW! 162,710 4 *
Op Amp Radio 404,061 80 *
Single Chip AM Radio NEW! 110,180 4 *
Single Chip FM Radio NEW! 185,491 1 *
Sound Level Meter 353,878 51 *
Stereo Tube Amplifier Weslee Kinsler 280,669 15 *
Tone Control 322,292 31
Transistor Organ 211,607 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,510 27 *
FM Telephone Bug 243,945 57
Phone Busy Indicator 223,396 24 *
Remote Telephone Ringer 127,028 3 *
Ringing Phone Light Flasher 230,825 35 *
Simple Phone Tap Derek Tombrello 393,558 98 *
Telephone Hold Button 138,025 10
Telephone Recorder 225,906 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.