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, July 27, 2026		 Fantastic Atom Expander33
12VDC To 120VAC Inverter32
Yesterday
Sunday, July 26, 2026		 Automatic 12V Lead Acid Battery Charger59
12VDC To 120VAC Inverter37
Of All Time 12VDC To 120VAC Inverter1,566,903
FM Transmitter1,036,850

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,056 61 *
Car Alarm Arming Horn Beep Canceller bob 146,601 6 *
Wireless Auto Tachometer 355,661 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 169,655 29 *
Parallel (Printer) Port Interface 301,981 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 462,180 63 *
3 Channel Spectrum Analyzer 235,926 20
40W Fluorescent Lamp Inverter Bart Milnes 341,997 60 *
Adjustable Strobe Light 323,099 36
Black Light 298,273 29
Colour (Sound) Organ 305,399 36
Electronic Dice NEW! 201,615 10 *
Fantastic Atom Expander 213,602 25
Flash Slave Trigger 234,144 18 *
Infa-Red Remote Control 653,377 216 *
IR Remote Extender NEW! 144,896 3 *
IR Remote Jammer Carl 280,290 110 *
IR Remote Switch NEW! 169,165 9 *
LASER Transmitter/Receiver 432,415 92
LED Chaser 462,343 83 *
LED Metronome NEW! 111,089 3 *
LED Thermometer 217,727 22 *
Light/Dark Detector 317,237 90 *
Simple Colour Organ 148,111 11 *
Strobe Light 287,192 27 *
TRIAC Light Dimmer 569,271 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 375,035 122 *
Electromagnetic Levitator NEW! 155,629 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 942,307 214 *
AC Motor Speed Controller 409,638 29 *
Air Flow Detector 263,761 54 *
Digital Keypad Combination Lock 213,294 20
Low Voltage Alarm 241,612 58 *
Pine Racecar Victory Judge 112,865 1 *
Pulse Width Modulation DC Motor Control 670,811 94
Rain Detector 317,616 112 *
Simple Lie Detector 579,963 323
Simple Polarity Tester Dudley LeRoux 177,536 13 *
Simple Servo Controller 234,364 22 *
Simple Touch Switch NEW! 182,574 6 *
Simple Two Speed Contactor DC Motor Controller 217,960 21 *
Stepper Motor Controller 770,481 120 *
Time Delay Relay 570,200 88
Time Delay Relay II jawaharlal@excite.com 260,007 39 *
Touch Switch 302,807 51 *
Video Activated Relay 132,515 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 195,863 10 *
Water Detector With Sump/Bilge Pump Controller 164,799 18 *
Wire Loop Alarm Alex Meaden 216,892 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 336,731 25 *
12VDC To 120VAC Inverter 1,566,903 691
6V to 12V Converter 544,922 121
Automatic 12V Lead Acid Battery Charger 955,767 248
Automatic Load Sensing Power Switch 179,820 16 *
Car Battery Charger 899,725 159 *
Dual Polarity Power Supply 386,365 84 *
Fixed Voltage Power Supply 324,186 52 *
High Current Power Supply 356,461 66 *
High Voltage High Current Power Supply 277,463 35 *
LASER Power Supply 310,272 28
Portable CD Player Adapter For Car 224,559 12 *
Power Supply 755,324 259 *
Solid State Tesla Coil NEW! 161,898 4
Solid State Tesla Coil/High Voltage Generator 463,590 51
Transformerless Power Supply 477,549 117 *
Voltage Inverter 358,856 51 *
Voltage Inverter II 216,533 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 599,489 182
3 Watt FM Transmitter Rae XL Tkacik 354,314 83 *
50 Watt Amplifier 524,229 74
8 Note Tune Player 151,996 12 *
8 Watt Audio Amp 391,236 67 *
Aircraft Radio Communications Receiver 295,468 50 *
Crystal Radio 174,630 53 *
Digital Volume Control 353,656 47 *
Electronic Stethoscope 337,250 142 *
FET Audio Mixer 357,569 41
FM Transmitter 1,036,850 420
Guitar Fuzz Effect 263,467 54 *
Microphone Mixer Anatoly I. Shikhatov 263,922 26 *
Mono To Stereo Synthesizer oRbEq 147,835 18 *
One Tube Regenerative Radio NEW! 165,764 4 *
Op Amp Radio 406,659 80 *
Single Chip AM Radio NEW! 112,323 4 *
Single Chip FM Radio NEW! 187,946 1 *
Sound Level Meter 356,142 51 *
Stereo Tube Amplifier Weslee Kinsler 282,878 15 *
Tone Control 324,486 31
Transistor Organ 213,908 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,309 27 *
FM Telephone Bug 245,832 57
Phone Busy Indicator 225,433 24 *
Remote Telephone Ringer 128,776 3 *
Ringing Phone Light Flasher 233,398 35 *
Simple Phone Tap Derek Tombrello 395,406 98 *
Telephone Hold Button 139,759 10
Telephone Recorder 227,738 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.