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
Sunday, October 19, 2025		 FM Transmitter37
12VDC To 120VAC Inverter33
Yesterday
Saturday, October 18, 2025		 12VDC To 120VAC Inverter50
FM Transmitter37
Of All Time 12VDC To 120VAC Inverter1,554,558
FM Transmitter1,026,963

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,155 61 *
Car Alarm Arming Horn Beep Canceller bob 142,893 6 *
Wireless Auto Tachometer 351,106 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,229 29 *
Parallel (Printer) Port Interface 296,599 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,914 63 *
3 Channel Spectrum Analyzer 231,132 20
40W Fluorescent Lamp Inverter Bart Milnes 337,757 60 *
Adjustable Strobe Light 318,435 36
Black Light 292,476 29
Colour (Sound) Organ 300,140 36
Electronic Dice NEW! 197,028 10 *
Fantastic Atom Expander 209,692 25
Flash Slave Trigger 229,482 18 *
Infa-Red Remote Control 647,751 216 *
IR Remote Extender NEW! 140,575 3 *
IR Remote Jammer Carl 275,281 110 *
IR Remote Switch NEW! 164,933 9 *
LASER Transmitter/Receiver 427,205 92
LED Chaser 456,582 83 *
LED Metronome NEW! 106,742 3 *
LED Thermometer 213,967 22 *
Light/Dark Detector 313,314 90 *
Simple Colour Organ 144,270 11 *
Strobe Light 283,197 27 *
TRIAC Light Dimmer 563,135 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,335 122 *
Electromagnetic Levitator NEW! 151,616 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,783 214 *
AC Motor Speed Controller 403,795 29 *
Air Flow Detector 259,378 54 *
Digital Keypad Combination Lock 209,197 20
Low Voltage Alarm 237,105 58 *
Pine Racecar Victory Judge 109,179 1 *
Pulse Width Modulation DC Motor Control 665,419 94
Rain Detector 312,935 112 *
Simple Lie Detector 574,806 323
Simple Polarity Tester Dudley LeRoux 172,893 13 *
Simple Servo Controller 229,892 22 *
Simple Touch Switch NEW! 177,988 6 *
Simple Two Speed Contactor DC Motor Controller 213,310 21 *
Stepper Motor Controller 763,285 120 *
Time Delay Relay 565,238 88
Time Delay Relay II jawaharlal@excite.com 255,513 39 *
Touch Switch 298,290 51 *
Video Activated Relay 128,761 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,792 10 *
Water Detector With Sump/Bilge Pump Controller 160,279 18 *
Wire Loop Alarm Alex Meaden 212,995 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 329,359 25 *
12VDC To 120VAC Inverter 1,554,558 691
6V to 12V Converter 538,871 121
Automatic 12V Lead Acid Battery Charger 948,875 248
Automatic Load Sensing Power Switch 175,418 16 *
Car Battery Charger 894,148 159 *
Dual Polarity Power Supply 380,850 84 *
Fixed Voltage Power Supply 320,041 52 *
High Current Power Supply 350,811 66 *
High Voltage High Current Power Supply 272,707 35 *
LASER Power Supply 305,500 28
Portable CD Player Adapter For Car 219,977 12 *
Power Supply 749,719 259 *
Solid State Tesla Coil NEW! 156,186 4
Solid State Tesla Coil/High Voltage Generator 456,511 51
Transformerless Power Supply 472,619 117 *
Voltage Inverter 352,522 51 *
Voltage Inverter II 211,925 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,825 182
3 Watt FM Transmitter Rae XL Tkacik 348,161 83 *
50 Watt Amplifier 519,053 74
8 Note Tune Player 148,018 12 *
8 Watt Audio Amp 385,129 67 *
Aircraft Radio Communications Receiver 289,973 50 *
Crystal Radio 168,749 53 *
Digital Volume Control 348,598 47 *
Electronic Stethoscope 331,710 142 *
FET Audio Mixer 353,008 41
FM Transmitter 1,026,963 420
Guitar Fuzz Effect 257,645 54 *
Microphone Mixer Anatoly I. Shikhatov 259,437 26 *
Mono To Stereo Synthesizer oRbEq 142,970 18 *
One Tube Regenerative Radio NEW! 158,790 4 *
Op Amp Radio 401,154 80 *
Single Chip AM Radio NEW! 107,787 4 *
Single Chip FM Radio NEW! 182,570 1 *
Sound Level Meter 351,225 51 *
Stereo Tube Amplifier Weslee Kinsler 277,565 15 *
Tone Control 319,417 31
Transistor Organ 209,036 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,513 27 *
FM Telephone Bug 242,132 57
Phone Busy Indicator 221,323 24 *
Remote Telephone Ringer 124,944 3 *
Ringing Phone Light Flasher 228,090 35 *
Simple Phone Tap Derek Tombrello 391,419 98 *
Telephone Hold Button 136,194 10
Telephone Recorder 224,025 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.