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
Saturday, November 15, 2025		 FM Transmitter35
12VDC To 120VAC Inverter30
Yesterday
Friday, November 14, 2025		 12VDC To 120VAC Inverter53
FM Transmitter51
Of All Time 12VDC To 120VAC Inverter1,556,089
FM Transmitter1,028,301

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,769 61 *
Car Alarm Arming Horn Beep Canceller bob 143,516 6 *
Wireless Auto Tachometer 351,867 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,740 29 *
Parallel (Printer) Port Interface 297,397 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,772 63 *
3 Channel Spectrum Analyzer 231,845 20
40W Fluorescent Lamp Inverter Bart Milnes 338,374 60 *
Adjustable Strobe Light 319,134 36
Black Light 293,485 29
Colour (Sound) Organ 300,877 36
Electronic Dice NEW! 197,784 10 *
Fantastic Atom Expander 210,317 25
Flash Slave Trigger 230,138 18 *
Infa-Red Remote Control 648,633 216 *
IR Remote Extender NEW! 141,263 3 *
IR Remote Jammer Carl 276,025 110 *
IR Remote Switch NEW! 165,587 9 *
LASER Transmitter/Receiver 428,016 92
LED Chaser 457,335 83 *
LED Metronome NEW! 107,419 3 *
LED Thermometer 214,571 22 *
Light/Dark Detector 313,948 90 *
Simple Colour Organ 144,914 11 *
Strobe Light 283,814 27 *
TRIAC Light Dimmer 563,997 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,092 122 *
Electromagnetic Levitator NEW! 152,220 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 935,827 214 *
AC Motor Speed Controller 404,683 29 *
Air Flow Detector 259,988 54 *
Digital Keypad Combination Lock 209,879 20
Low Voltage Alarm 237,801 58 *
Pine Racecar Victory Judge 109,814 1 *
Pulse Width Modulation DC Motor Control 666,257 94
Rain Detector 313,685 112 *
Simple Lie Detector 575,681 323
Simple Polarity Tester Dudley LeRoux 173,755 13 *
Simple Servo Controller 230,560 22 *
Simple Touch Switch NEW! 178,597 6 *
Simple Two Speed Contactor DC Motor Controller 214,055 21 *
Stepper Motor Controller 764,389 120 *
Time Delay Relay 565,936 88
Time Delay Relay II jawaharlal@excite.com 256,308 39 *
Touch Switch 298,955 51 *
Video Activated Relay 129,413 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,650 10 *
Water Detector With Sump/Bilge Pump Controller 161,012 18 *
Wire Loop Alarm Alex Meaden 213,570 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,522 25 *
12VDC To 120VAC Inverter 1,556,089 691
6V to 12V Converter 539,696 121
Automatic 12V Lead Acid Battery Charger 949,720 248
Automatic Load Sensing Power Switch 176,093 16 *
Car Battery Charger 894,966 159 *
Dual Polarity Power Supply 381,753 84 *
Fixed Voltage Power Supply 320,698 52 *
High Current Power Supply 351,731 66 *
High Voltage High Current Power Supply 273,429 35 *
LASER Power Supply 306,220 28
Portable CD Player Adapter For Car 220,678 12 *
Power Supply 750,471 259 *
Solid State Tesla Coil NEW! 156,942 4
Solid State Tesla Coil/High Voltage Generator 457,439 51
Transformerless Power Supply 473,494 117 *
Voltage Inverter 353,540 51 *
Voltage Inverter II 212,643 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,498 182
3 Watt FM Transmitter Rae XL Tkacik 349,026 83 *
50 Watt Amplifier 519,852 74
8 Note Tune Player 148,673 12 *
8 Watt Audio Amp 385,969 67 *
Aircraft Radio Communications Receiver 290,723 50 *
Crystal Radio 169,589 53 *
Digital Volume Control 349,424 47 *
Electronic Stethoscope 332,509 142 *
FET Audio Mixer 353,687 41
FM Transmitter 1,028,301 420
Guitar Fuzz Effect 258,608 54 *
Microphone Mixer Anatoly I. Shikhatov 260,098 26 *
Mono To Stereo Synthesizer oRbEq 143,737 18 *
One Tube Regenerative Radio NEW! 159,879 4 *
Op Amp Radio 401,941 80 *
Single Chip AM Radio NEW! 108,421 4 *
Single Chip FM Radio NEW! 183,361 1 *
Sound Level Meter 351,981 51 *
Stereo Tube Amplifier Weslee Kinsler 278,387 15 *
Tone Control 320,176 31
Transistor Organ 209,739 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,091 27 *
FM Telephone Bug 242,552 57
Phone Busy Indicator 221,817 24 *
Remote Telephone Ringer 125,338 3 *
Ringing Phone Light Flasher 228,670 35 *
Simple Phone Tap Derek Tombrello 391,862 98 *
Telephone Hold Button 136,590 10
Telephone Recorder 224,438 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.