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
Wednesday, July 01, 2026		 12VDC To 120VAC Inverter23
Electronic Stethoscope14
Yesterday
Tuesday, June 30, 2026		 IR Remote Jammer121
Crystal Radio41
Of All Time 12VDC To 120VAC Inverter1,565,613
FM Transmitter1,036,242

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,677 61 *
Car Alarm Arming Horn Beep Canceller bob 146,256 6 *
Wireless Auto Tachometer 355,244 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 169,294 29 *
Parallel (Printer) Port Interface 301,484 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 461,655 63 *
3 Channel Spectrum Analyzer 235,461 20
40W Fluorescent Lamp Inverter Bart Milnes 341,645 60 *
Adjustable Strobe Light 322,651 36
Black Light 297,689 29
Colour (Sound) Organ 304,907 36
Electronic Dice NEW! 201,180 10 *
Fantastic Atom Expander 213,201 25
Flash Slave Trigger 233,565 18 *
Infa-Red Remote Control 652,852 216 *
IR Remote Extender NEW! 144,478 3 *
IR Remote Jammer Carl 279,856 110 *
IR Remote Switch NEW! 168,771 9 *
LASER Transmitter/Receiver 431,956 92
LED Chaser 461,874 83 *
LED Metronome NEW! 110,651 3 *
LED Thermometer 217,367 22 *
Light/Dark Detector 316,839 90 *
Simple Colour Organ 147,734 11 *
Strobe Light 286,783 27 *
TRIAC Light Dimmer 568,516 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 374,475 122 *
Electromagnetic Levitator NEW! 155,254 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 941,692 214 *
AC Motor Speed Controller 409,143 29 *
Air Flow Detector 263,343 54 *
Digital Keypad Combination Lock 212,902 20
Low Voltage Alarm 241,195 58 *
Pine Racecar Victory Judge 112,505 1 *
Pulse Width Modulation DC Motor Control 670,316 94
Rain Detector 317,152 112 *
Simple Lie Detector 579,509 323
Simple Polarity Tester Dudley LeRoux 177,136 13 *
Simple Servo Controller 233,948 22 *
Simple Touch Switch NEW! 182,113 6 *
Simple Two Speed Contactor DC Motor Controller 217,456 21 *
Stepper Motor Controller 769,944 120 *
Time Delay Relay 569,740 88
Time Delay Relay II jawaharlal@excite.com 259,598 39 *
Touch Switch 302,326 51 *
Video Activated Relay 132,099 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 194,656 10 *
Water Detector With Sump/Bilge Pump Controller 164,431 18 *
Wire Loop Alarm Alex Meaden 216,465 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 336,028 25 *
12VDC To 120VAC Inverter 1,565,613 691
6V to 12V Converter 544,220 121
Automatic 12V Lead Acid Battery Charger 955,046 248
Automatic Load Sensing Power Switch 179,432 16 *
Car Battery Charger 899,241 159 *
Dual Polarity Power Supply 385,926 84 *
Fixed Voltage Power Supply 323,794 52 *
High Current Power Supply 355,937 66 *
High Voltage High Current Power Supply 276,997 35 *
LASER Power Supply 309,683 28
Portable CD Player Adapter For Car 223,973 12 *
Power Supply 754,743 259 *
Solid State Tesla Coil NEW! 161,439 4
Solid State Tesla Coil/High Voltage Generator 462,705 51
Transformerless Power Supply 477,085 117 *
Voltage Inverter 358,200 51 *
Voltage Inverter II 216,081 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 599,071 182
3 Watt FM Transmitter Rae XL Tkacik 353,734 83 *
50 Watt Amplifier 523,776 74
8 Note Tune Player 151,629 12 *
8 Watt Audio Amp 390,707 67 *
Aircraft Radio Communications Receiver 294,975 50 *
Crystal Radio 174,118 53 *
Digital Volume Control 353,169 47 *
Electronic Stethoscope 336,788 142 *
FET Audio Mixer 357,124 41
FM Transmitter 1,036,242 420
Guitar Fuzz Effect 262,870 54 *
Microphone Mixer Anatoly I. Shikhatov 263,515 26 *
Mono To Stereo Synthesizer oRbEq 147,407 18 *
One Tube Regenerative Radio NEW! 165,188 4 *
Op Amp Radio 406,133 80 *
Single Chip AM Radio NEW! 111,724 4 *
Single Chip FM Radio NEW! 187,411 1 *
Sound Level Meter 355,685 51 *
Stereo Tube Amplifier Weslee Kinsler 282,444 15 *
Tone Control 324,035 31
Transistor Organ 213,453 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,904 27 *
FM Telephone Bug 245,426 57
Phone Busy Indicator 225,014 24 *
Remote Telephone Ringer 128,400 3 *
Ringing Phone Light Flasher 232,777 35 *
Simple Phone Tap Derek Tombrello 395,019 98 *
Telephone Hold Button 139,441 10
Telephone Recorder 227,329 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.