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
Monday, January 26, 2026		 FM Transmitter36
Single Chip FM Radio26
Yesterday
Sunday, January 25, 2026		 12V To 24V DC-DC Converter51
12VDC To 120VAC Inverter49
Of All Time 12VDC To 120VAC Inverter1,559,494
FM Transmitter1,030,781

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,753 61 *
Car Alarm Arming Horn Beep Canceller bob 144,480 6 *
Wireless Auto Tachometer 353,039 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,535 29 *
Parallel (Printer) Port Interface 298,804 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,986 63 *
3 Channel Spectrum Analyzer 233,034 20
40W Fluorescent Lamp Inverter Bart Milnes 339,550 60 *
Adjustable Strobe Light 320,279 36
Black Light 294,897 29
Colour (Sound) Organ 302,282 36
Electronic Dice NEW! 198,905 10 *
Fantastic Atom Expander 211,334 25
Flash Slave Trigger 231,368 18 *
Infa-Red Remote Control 649,972 216 *
IR Remote Extender NEW! 142,405 3 *
IR Remote Jammer Carl 277,209 110 *
IR Remote Switch NEW! 166,739 9 *
LASER Transmitter/Receiver 429,303 92
LED Chaser 458,873 83 *
LED Metronome NEW! 108,473 3 *
LED Thermometer 215,457 22 *
Light/Dark Detector 314,926 90 *
Simple Colour Organ 145,881 11 *
Strobe Light 284,832 27 *
TRIAC Light Dimmer 565,371 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,297 122 *
Electromagnetic Levitator NEW! 153,221 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 938,040 214 *
AC Motor Speed Controller 406,335 29 *
Air Flow Detector 261,119 54 *
Digital Keypad Combination Lock 210,931 20
Low Voltage Alarm 239,016 58 *
Pine Racecar Victory Judge 110,710 1 *
Pulse Width Modulation DC Motor Control 667,657 94
Rain Detector 314,834 112 *
Simple Lie Detector 577,063 323
Simple Polarity Tester Dudley LeRoux 174,962 13 *
Simple Servo Controller 231,779 22 *
Simple Touch Switch NEW! 179,932 6 *
Simple Two Speed Contactor DC Motor Controller 215,162 21 *
Stepper Motor Controller 766,308 120 *
Time Delay Relay 567,233 88
Time Delay Relay II jawaharlal@excite.com 257,494 39 *
Touch Switch 300,118 51 *
Video Activated Relay 130,337 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,127 10 *
Water Detector With Sump/Bilge Pump Controller 162,233 18 *
Wire Loop Alarm Alex Meaden 214,545 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 332,487 25 *
12VDC To 120VAC Inverter 1,559,494 691
6V to 12V Converter 541,249 121
Automatic 12V Lead Acid Battery Charger 951,513 248
Automatic Load Sensing Power Switch 177,201 16 *
Car Battery Charger 896,485 159 *
Dual Polarity Power Supply 383,301 84 *
Fixed Voltage Power Supply 321,785 52 *
High Current Power Supply 353,273 66 *
High Voltage High Current Power Supply 274,703 35 *
LASER Power Supply 307,348 28
Portable CD Player Adapter For Car 221,881 12 *
Power Supply 751,851 259 *
Solid State Tesla Coil NEW! 158,592 4
Solid State Tesla Coil/High Voltage Generator 459,209 51
Transformerless Power Supply 474,807 117 *
Voltage Inverter 355,210 51 *
Voltage Inverter II 213,840 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,807 182
3 Watt FM Transmitter Rae XL Tkacik 350,656 83 *
50 Watt Amplifier 521,260 74
8 Note Tune Player 149,752 12 *
8 Watt Audio Amp 387,522 67 *
Aircraft Radio Communications Receiver 292,189 50 *
Crystal Radio 171,186 53 *
Digital Volume Control 350,812 47 *
Electronic Stethoscope 333,776 142 *
FET Audio Mixer 354,826 41
FM Transmitter 1,030,781 420
Guitar Fuzz Effect 260,097 54 *
Microphone Mixer Anatoly I. Shikhatov 261,232 26 *
Mono To Stereo Synthesizer oRbEq 144,939 18 *
One Tube Regenerative Radio NEW! 161,797 4 *
Op Amp Radio 403,310 80 *
Single Chip AM Radio NEW! 109,583 4 *
Single Chip FM Radio NEW! 184,862 1 *
Sound Level Meter 353,206 51 *
Stereo Tube Amplifier Weslee Kinsler 279,973 15 *
Tone Control 321,609 31
Transistor Organ 210,974 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,034 27 *
FM Telephone Bug 243,456 57
Phone Busy Indicator 222,834 24 *
Remote Telephone Ringer 126,470 3 *
Ringing Phone Light Flasher 230,054 35 *
Simple Phone Tap Derek Tombrello 392,929 98 *
Telephone Hold Button 137,529 10
Telephone Recorder 225,417 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.