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
Tuesday, December 16, 2025		 7 Segment LED Counter11
12VDC To 120VAC Inverter9
Yesterday
Monday, December 15, 2025		 12VDC To 120VAC Inverter37
LED Chaser29
Of All Time 12VDC To 120VAC Inverter1,557,540
FM Transmitter1,029,452

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,143 61 *
Car Alarm Arming Horn Beep Canceller bob 143,905 6 *
Wireless Auto Tachometer 352,313 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,044 29 *
Parallel (Printer) Port Interface 297,993 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,255 63 *
3 Channel Spectrum Analyzer 232,307 20
40W Fluorescent Lamp Inverter Bart Milnes 338,798 60 *
Adjustable Strobe Light 319,589 36
Black Light 293,998 29
Colour (Sound) Organ 301,446 36
Electronic Dice NEW! 198,239 10 *
Fantastic Atom Expander 210,694 25
Flash Slave Trigger 230,617 18 *
Infa-Red Remote Control 649,196 216 *
IR Remote Extender NEW! 141,689 3 *
IR Remote Jammer Carl 276,507 110 *
IR Remote Switch NEW! 166,080 9 *
LASER Transmitter/Receiver 428,544 92
LED Chaser 457,975 83 *
LED Metronome NEW! 107,854 3 *
LED Thermometer 214,920 22 *
Light/Dark Detector 314,330 90 *
Simple Colour Organ 145,315 11 *
Strobe Light 284,230 27 *
TRIAC Light Dimmer 564,515 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,575 122 *
Electromagnetic Levitator NEW! 152,601 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 936,847 214 *
AC Motor Speed Controller 405,407 29 *
Air Flow Detector 260,437 54 *
Digital Keypad Combination Lock 210,293 20
Low Voltage Alarm 238,289 58 *
Pine Racecar Victory Judge 110,151 1 *
Pulse Width Modulation DC Motor Control 666,781 94
Rain Detector 314,181 112 *
Simple Lie Detector 576,177 323
Simple Polarity Tester Dudley LeRoux 174,238 13 *
Simple Servo Controller 230,996 22 *
Simple Touch Switch NEW! 179,118 6 *
Simple Two Speed Contactor DC Motor Controller 214,500 21 *
Stepper Motor Controller 765,220 120 *
Time Delay Relay 566,447 88
Time Delay Relay II jawaharlal@excite.com 256,789 39 *
Touch Switch 299,402 51 *
Video Activated Relay 129,793 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,266 10 *
Water Detector With Sump/Bilge Pump Controller 161,487 18 *
Wire Loop Alarm Alex Meaden 213,952 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,366 25 *
12VDC To 120VAC Inverter 1,557,540 691
6V to 12V Converter 540,342 121
Automatic 12V Lead Acid Battery Charger 950,433 248
Automatic Load Sensing Power Switch 176,543 16 *
Car Battery Charger 895,638 159 *
Dual Polarity Power Supply 382,448 84 *
Fixed Voltage Power Supply 321,162 52 *
High Current Power Supply 352,383 66 *
High Voltage High Current Power Supply 273,916 35 *
LASER Power Supply 306,665 28
Portable CD Player Adapter For Car 221,184 12 *
Power Supply 751,034 259 *
Solid State Tesla Coil NEW! 157,610 4
Solid State Tesla Coil/High Voltage Generator 458,107 51
Transformerless Power Supply 474,029 117 *
Voltage Inverter 354,247 51 *
Voltage Inverter II 213,132 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,010 182
3 Watt FM Transmitter Rae XL Tkacik 349,706 83 *
50 Watt Amplifier 520,412 74
8 Note Tune Player 149,066 12 *
8 Watt Audio Amp 386,596 67 *
Aircraft Radio Communications Receiver 291,257 50 *
Crystal Radio 170,220 53 *
Digital Volume Control 349,981 47 *
Electronic Stethoscope 333,038 142 *
FET Audio Mixer 354,133 41
FM Transmitter 1,029,452 420
Guitar Fuzz Effect 259,229 54 *
Microphone Mixer Anatoly I. Shikhatov 260,548 26 *
Mono To Stereo Synthesizer oRbEq 144,224 18 *
One Tube Regenerative Radio NEW! 160,710 4 *
Op Amp Radio 402,526 80 *
Single Chip AM Radio NEW! 108,869 4 *
Single Chip FM Radio NEW! 183,928 1 *
Sound Level Meter 352,475 51 *
Stereo Tube Amplifier Weslee Kinsler 279,030 15 *
Tone Control 320,716 31
Transistor Organ 210,210 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,462 27 *
FM Telephone Bug 242,883 57
Phone Busy Indicator 222,222 24 *
Remote Telephone Ringer 125,798 3 *
Ringing Phone Light Flasher 229,223 35 *
Simple Phone Tap Derek Tombrello 392,277 98 *
Telephone Hold Button 136,932 10
Telephone Recorder 224,822 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.