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
Sunday, November 16, 2025		 12VDC To 120VAC Inverter36
FM Transmitter34
Yesterday
Saturday, November 15, 2025		 FM Transmitter54
12VDC To 120VAC Inverter50
Of All Time 12VDC To 120VAC Inverter1,556,150
FM Transmitter1,028,354

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,787 61 *
Car Alarm Arming Horn Beep Canceller bob 143,544 6 *
Wireless Auto Tachometer 351,889 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,759 29 *
Parallel (Printer) Port Interface 297,425 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,799 63 *
3 Channel Spectrum Analyzer 231,865 20
40W Fluorescent Lamp Inverter Bart Milnes 338,402 60 *
Adjustable Strobe Light 319,154 36
Black Light 293,512 29
Colour (Sound) Organ 300,914 36
Electronic Dice NEW! 197,809 10 *
Fantastic Atom Expander 210,333 25
Flash Slave Trigger 230,158 18 *
Infa-Red Remote Control 648,658 216 *
IR Remote Extender NEW! 141,282 3 *
IR Remote Jammer Carl 276,056 110 *
IR Remote Switch NEW! 165,610 9 *
LASER Transmitter/Receiver 428,037 92
LED Chaser 457,359 83 *
LED Metronome NEW! 107,435 3 *
LED Thermometer 214,585 22 *
Light/Dark Detector 313,967 90 *
Simple Colour Organ 144,929 11 *
Strobe Light 283,834 27 *
TRIAC Light Dimmer 564,011 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,110 122 *
Electromagnetic Levitator NEW! 152,233 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 935,861 214 *
AC Motor Speed Controller 404,713 29 *
Air Flow Detector 260,007 54 *
Digital Keypad Combination Lock 209,892 20
Low Voltage Alarm 237,829 58 *
Pine Racecar Victory Judge 109,827 1 *
Pulse Width Modulation DC Motor Control 666,281 94
Rain Detector 313,705 112 *
Simple Lie Detector 575,703 323
Simple Polarity Tester Dudley LeRoux 173,783 13 *
Simple Servo Controller 230,582 22 *
Simple Touch Switch NEW! 178,616 6 *
Simple Two Speed Contactor DC Motor Controller 214,075 21 *
Stepper Motor Controller 764,431 120 *
Time Delay Relay 565,963 88
Time Delay Relay II jawaharlal@excite.com 256,338 39 *
Touch Switch 298,970 51 *
Video Activated Relay 129,435 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,689 10 *
Water Detector With Sump/Bilge Pump Controller 161,042 18 *
Wire Loop Alarm Alex Meaden 213,588 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,564 25 *
12VDC To 120VAC Inverter 1,556,150 691
6V to 12V Converter 539,727 121
Automatic 12V Lead Acid Battery Charger 949,757 248
Automatic Load Sensing Power Switch 176,123 16 *
Car Battery Charger 894,996 159 *
Dual Polarity Power Supply 381,791 84 *
Fixed Voltage Power Supply 320,716 52 *
High Current Power Supply 351,765 66 *
High Voltage High Current Power Supply 273,445 35 *
LASER Power Supply 306,240 28
Portable CD Player Adapter For Car 220,703 12 *
Power Supply 750,491 259 *
Solid State Tesla Coil NEW! 156,964 4
Solid State Tesla Coil/High Voltage Generator 457,475 51
Transformerless Power Supply 473,527 117 *
Voltage Inverter 353,569 51 *
Voltage Inverter II 212,666 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,523 182
3 Watt FM Transmitter Rae XL Tkacik 349,049 83 *
50 Watt Amplifier 519,882 74
8 Note Tune Player 148,690 12 *
8 Watt Audio Amp 385,996 67 *
Aircraft Radio Communications Receiver 290,743 50 *
Crystal Radio 169,619 53 *
Digital Volume Control 349,454 47 *
Electronic Stethoscope 332,539 142 *
FET Audio Mixer 353,705 41
FM Transmitter 1,028,354 420
Guitar Fuzz Effect 258,632 54 *
Microphone Mixer Anatoly I. Shikhatov 260,124 26 *
Mono To Stereo Synthesizer oRbEq 143,762 18 *
One Tube Regenerative Radio NEW! 159,914 4 *
Op Amp Radio 401,974 80 *
Single Chip AM Radio NEW! 108,453 4 *
Single Chip FM Radio NEW! 183,398 1 *
Sound Level Meter 352,011 51 *
Stereo Tube Amplifier Weslee Kinsler 278,415 15 *
Tone Control 320,206 31
Transistor Organ 209,758 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,099 27 *
FM Telephone Bug 242,561 57
Phone Busy Indicator 221,829 24 *
Remote Telephone Ringer 125,351 3 *
Ringing Phone Light Flasher 228,699 35 *
Simple Phone Tap Derek Tombrello 391,877 98 *
Telephone Hold Button 136,604 10
Telephone Recorder 224,456 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.