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, November 06, 2025		 FM Transmitter22
Ringing Phone Light Flasher17
Yesterday
Wednesday, November 05, 2025		 12VDC To 120VAC Inverter59
12V To 24V DC-DC Converter46
Of All Time 12VDC To 120VAC Inverter1,555,644
FM Transmitter1,027,858

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,613 61 *
Car Alarm Arming Horn Beep Canceller bob 143,355 6 *
Wireless Auto Tachometer 351,675 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,614 29 *
Parallel (Printer) Port Interface 297,165 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,507 63 *
3 Channel Spectrum Analyzer 231,624 20
40W Fluorescent Lamp Inverter Bart Milnes 338,178 60 *
Adjustable Strobe Light 318,954 36
Black Light 293,216 29
Colour (Sound) Organ 300,691 36
Electronic Dice NEW! 197,576 10 *
Fantastic Atom Expander 210,123 25
Flash Slave Trigger 229,952 18 *
Infa-Red Remote Control 648,326 216 *
IR Remote Extender NEW! 141,061 3 *
IR Remote Jammer Carl 275,821 110 *
IR Remote Switch NEW! 165,386 9 *
LASER Transmitter/Receiver 427,807 92
LED Chaser 457,146 83 *
LED Metronome NEW! 107,245 3 *
LED Thermometer 214,403 22 *
Light/Dark Detector 313,766 90 *
Simple Colour Organ 144,721 11 *
Strobe Light 283,659 27 *
TRIAC Light Dimmer 563,751 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,876 122 *
Electromagnetic Levitator NEW! 152,058 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 935,497 214 *
AC Motor Speed Controller 404,466 29 *
Air Flow Detector 259,821 54 *
Digital Keypad Combination Lock 209,709 20
Low Voltage Alarm 237,602 58 *
Pine Racecar Victory Judge 109,660 1 *
Pulse Width Modulation DC Motor Control 665,994 94
Rain Detector 313,458 112 *
Simple Lie Detector 575,460 323
Simple Polarity Tester Dudley LeRoux 173,480 13 *
Simple Servo Controller 230,402 22 *
Simple Touch Switch NEW! 178,432 6 *
Simple Two Speed Contactor DC Motor Controller 213,837 21 *
Stepper Motor Controller 764,036 120 *
Time Delay Relay 565,775 88
Time Delay Relay II jawaharlal@excite.com 256,051 39 *
Touch Switch 298,765 51 *
Video Activated Relay 129,198 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,341 10 *
Water Detector With Sump/Bilge Pump Controller 160,809 18 *
Wire Loop Alarm Alex Meaden 213,434 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,150 25 *
12VDC To 120VAC Inverter 1,555,644 691
6V to 12V Converter 539,466 121
Automatic 12V Lead Acid Battery Charger 949,496 248
Automatic Load Sensing Power Switch 175,899 16 *
Car Battery Charger 894,770 159 *
Dual Polarity Power Supply 381,466 84 *
Fixed Voltage Power Supply 320,498 52 *
High Current Power Supply 351,444 66 *
High Voltage High Current Power Supply 273,249 35 *
LASER Power Supply 306,011 28
Portable CD Player Adapter For Car 220,457 12 *
Power Supply 750,274 259 *
Solid State Tesla Coil NEW! 156,713 4
Solid State Tesla Coil/High Voltage Generator 457,161 51
Transformerless Power Supply 473,219 117 *
Voltage Inverter 353,247 51 *
Voltage Inverter II 212,452 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,322 182
3 Watt FM Transmitter Rae XL Tkacik 348,793 83 *
50 Watt Amplifier 519,630 74
8 Note Tune Player 148,461 12 *
8 Watt Audio Amp 385,768 67 *
Aircraft Radio Communications Receiver 290,469 50 *
Crystal Radio 169,347 53 *
Digital Volume Control 349,167 47 *
Electronic Stethoscope 332,294 142 *
FET Audio Mixer 353,496 41
FM Transmitter 1,027,858 420
Guitar Fuzz Effect 258,307 54 *
Microphone Mixer Anatoly I. Shikhatov 259,916 26 *
Mono To Stereo Synthesizer oRbEq 143,484 18 *
One Tube Regenerative Radio NEW! 159,541 4 *
Op Amp Radio 401,736 80 *
Single Chip AM Radio NEW! 108,254 4 *
Single Chip FM Radio NEW! 183,142 1 *
Sound Level Meter 351,788 51 *
Stereo Tube Amplifier Weslee Kinsler 278,156 15 *
Tone Control 319,957 31
Transistor Organ 209,558 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,914 27 *
FM Telephone Bug 242,437 57
Phone Busy Indicator 221,661 24 *
Remote Telephone Ringer 125,237 3 *
Ringing Phone Light Flasher 228,499 35 *
Simple Phone Tap Derek Tombrello 391,713 98 *
Telephone Hold Button 136,489 10
Telephone Recorder 224,300 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.