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, November 05, 2025		 Car Alarm Arming Horn Beep Canceller5
Solid State Tesla Coil/High Voltage Generator3
Yesterday
Tuesday, November 04, 2025		 12VDC To 120VAC Inverter76
Simple Lie Detector63
Of All Time 12VDC To 120VAC Inverter1,555,572
FM Transmitter1,027,793

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,586 61 *
Car Alarm Arming Horn Beep Canceller bob 143,327 6 *
Wireless Auto Tachometer 351,632 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,595 29 *
Parallel (Printer) Port Interface 297,118 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,461 63 *
3 Channel Spectrum Analyzer 231,588 20
40W Fluorescent Lamp Inverter Bart Milnes 338,151 60 *
Adjustable Strobe Light 318,925 36
Black Light 293,172 29
Colour (Sound) Organ 300,661 36
Electronic Dice NEW! 197,538 10 *
Fantastic Atom Expander 210,098 25
Flash Slave Trigger 229,924 18 *
Infa-Red Remote Control 648,291 216 *
IR Remote Extender NEW! 141,026 3 *
IR Remote Jammer Carl 275,789 110 *
IR Remote Switch NEW! 165,364 9 *
LASER Transmitter/Receiver 427,769 92
LED Chaser 457,116 83 *
LED Metronome NEW! 107,218 3 *
LED Thermometer 214,373 22 *
Light/Dark Detector 313,740 90 *
Simple Colour Organ 144,688 11 *
Strobe Light 283,637 27 *
TRIAC Light Dimmer 563,701 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,841 122 *
Electromagnetic Levitator NEW! 152,027 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 935,459 214 *
AC Motor Speed Controller 404,419 29 *
Air Flow Detector 259,801 54 *
Digital Keypad Combination Lock 209,674 20
Low Voltage Alarm 237,575 58 *
Pine Racecar Victory Judge 109,636 1 *
Pulse Width Modulation DC Motor Control 665,954 94
Rain Detector 313,417 112 *
Simple Lie Detector 575,435 323
Simple Polarity Tester Dudley LeRoux 173,434 13 *
Simple Servo Controller 230,368 22 *
Simple Touch Switch NEW! 178,404 6 *
Simple Two Speed Contactor DC Motor Controller 213,799 21 *
Stepper Motor Controller 763,991 120 *
Time Delay Relay 565,750 88
Time Delay Relay II jawaharlal@excite.com 256,015 39 *
Touch Switch 298,737 51 *
Video Activated Relay 129,160 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,306 10 *
Water Detector With Sump/Bilge Pump Controller 160,778 18 *
Wire Loop Alarm Alex Meaden 213,412 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,095 25 *
12VDC To 120VAC Inverter 1,555,572 691
6V to 12V Converter 539,429 121
Automatic 12V Lead Acid Battery Charger 949,467 248
Automatic Load Sensing Power Switch 175,870 16 *
Car Battery Charger 894,751 159 *
Dual Polarity Power Supply 381,430 84 *
Fixed Voltage Power Supply 320,475 52 *
High Current Power Supply 351,409 66 *
High Voltage High Current Power Supply 273,215 35 *
LASER Power Supply 305,975 28
Portable CD Player Adapter For Car 220,432 12 *
Power Supply 750,235 259 *
Solid State Tesla Coil NEW! 156,676 4
Solid State Tesla Coil/High Voltage Generator 457,122 51
Transformerless Power Supply 473,179 117 *
Voltage Inverter 353,211 51 *
Voltage Inverter II 212,414 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,286 182
3 Watt FM Transmitter Rae XL Tkacik 348,749 83 *
50 Watt Amplifier 519,594 74
8 Note Tune Player 148,429 12 *
8 Watt Audio Amp 385,724 67 *
Aircraft Radio Communications Receiver 290,440 50 *
Crystal Radio 169,321 53 *
Digital Volume Control 349,135 47 *
Electronic Stethoscope 332,250 142 *
FET Audio Mixer 353,464 41
FM Transmitter 1,027,793 420
Guitar Fuzz Effect 258,252 54 *
Microphone Mixer Anatoly I. Shikhatov 259,892 26 *
Mono To Stereo Synthesizer oRbEq 143,443 18 *
One Tube Regenerative Radio NEW! 159,488 4 *
Op Amp Radio 401,699 80 *
Single Chip AM Radio NEW! 108,227 4 *
Single Chip FM Radio NEW! 183,106 1 *
Sound Level Meter 351,751 51 *
Stereo Tube Amplifier Weslee Kinsler 278,109 15 *
Tone Control 319,918 31
Transistor Organ 209,528 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,881 27 *
FM Telephone Bug 242,424 57
Phone Busy Indicator 221,635 24 *
Remote Telephone Ringer 125,219 3 *
Ringing Phone Light Flasher 228,467 35 *
Simple Phone Tap Derek Tombrello 391,698 98 *
Telephone Hold Button 136,475 10
Telephone Recorder 224,283 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.