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, July 25, 2026		 Simple Touch Switch20
LED Chaser18
Yesterday
Friday, July 24, 2026		 FM Transmitter32
12VDC To 120VAC Inverter31
Of All Time 12VDC To 120VAC Inverter1,566,811
FM Transmitter1,036,793

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,006 61 *
Car Alarm Arming Horn Beep Canceller bob 146,567 6 *
Wireless Auto Tachometer 355,620 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 169,620 29 *
Parallel (Printer) Port Interface 301,928 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 462,133 63 *
3 Channel Spectrum Analyzer 235,875 20
40W Fluorescent Lamp Inverter Bart Milnes 341,967 60 *
Adjustable Strobe Light 323,060 36
Black Light 298,216 29
Colour (Sound) Organ 305,345 36
Electronic Dice NEW! 201,569 10 *
Fantastic Atom Expander 213,545 25
Flash Slave Trigger 234,098 18 *
Infa-Red Remote Control 653,334 216 *
IR Remote Extender NEW! 144,862 3 *
IR Remote Jammer Carl 280,249 110 *
IR Remote Switch NEW! 169,130 9 *
LASER Transmitter/Receiver 432,370 92
LED Chaser 462,308 83 *
LED Metronome NEW! 111,047 3 *
LED Thermometer 217,700 22 *
Light/Dark Detector 317,188 90 *
Simple Colour Organ 148,072 11 *
Strobe Light 287,153 27 *
TRIAC Light Dimmer 569,222 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 374,986 122 *
Electromagnetic Levitator NEW! 155,605 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 942,244 214 *
AC Motor Speed Controller 409,597 29 *
Air Flow Detector 263,721 54 *
Digital Keypad Combination Lock 213,261 20
Low Voltage Alarm 241,572 58 *
Pine Racecar Victory Judge 112,835 1 *
Pulse Width Modulation DC Motor Control 670,763 94
Rain Detector 317,566 112 *
Simple Lie Detector 579,925 323
Simple Polarity Tester Dudley LeRoux 177,498 13 *
Simple Servo Controller 234,315 22 *
Simple Touch Switch NEW! 182,526 6 *
Simple Two Speed Contactor DC Motor Controller 217,918 21 *
Stepper Motor Controller 770,427 120 *
Time Delay Relay 570,145 88
Time Delay Relay II jawaharlal@excite.com 259,970 39 *
Touch Switch 302,764 51 *
Video Activated Relay 132,469 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 195,825 10 *
Water Detector With Sump/Bilge Pump Controller 164,770 18 *
Wire Loop Alarm Alex Meaden 216,850 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 336,679 25 *
12VDC To 120VAC Inverter 1,566,811 691
6V to 12V Converter 544,872 121
Automatic 12V Lead Acid Battery Charger 955,662 248
Automatic Load Sensing Power Switch 179,787 16 *
Car Battery Charger 899,661 159 *
Dual Polarity Power Supply 386,327 84 *
Fixed Voltage Power Supply 324,147 52 *
High Current Power Supply 356,416 66 *
High Voltage High Current Power Supply 277,422 35 *
LASER Power Supply 310,224 28
Portable CD Player Adapter For Car 224,498 12 *
Power Supply 755,272 259 *
Solid State Tesla Coil NEW! 161,860 4
Solid State Tesla Coil/High Voltage Generator 463,520 51
Transformerless Power Supply 477,508 117 *
Voltage Inverter 358,804 51 *
Voltage Inverter II 216,492 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 599,448 182
3 Watt FM Transmitter Rae XL Tkacik 354,276 83 *
50 Watt Amplifier 524,198 74
8 Note Tune Player 151,967 12 *
8 Watt Audio Amp 391,184 67 *
Aircraft Radio Communications Receiver 295,433 50 *
Crystal Radio 174,583 53 *
Digital Volume Control 353,607 47 *
Electronic Stethoscope 337,214 142 *
FET Audio Mixer 357,529 41
FM Transmitter 1,036,793 420
Guitar Fuzz Effect 263,420 54 *
Microphone Mixer Anatoly I. Shikhatov 263,879 26 *
Mono To Stereo Synthesizer oRbEq 147,791 18 *
One Tube Regenerative Radio NEW! 165,705 4 *
Op Amp Radio 406,600 80 *
Single Chip AM Radio NEW! 112,289 4 *
Single Chip FM Radio NEW! 187,905 1 *
Sound Level Meter 356,089 51 *
Stereo Tube Amplifier Weslee Kinsler 282,838 15 *
Tone Control 324,451 31
Transistor Organ 213,860 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,271 27 *
FM Telephone Bug 245,786 57
Phone Busy Indicator 225,388 24 *
Remote Telephone Ringer 128,742 3 *
Ringing Phone Light Flasher 233,349 35 *
Simple Phone Tap Derek Tombrello 395,370 98 *
Telephone Hold Button 139,730 10
Telephone Recorder 227,705 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.