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, October 15, 2025		 Stepper Motor Controller24
12VDC To 120VAC Inverter23
Yesterday
Tuesday, October 14, 2025		 12V To 24V DC-DC Converter42
FM Transmitter35
Of All Time 12VDC To 120VAC Inverter1,554,366
FM Transmitter1,026,805

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,099 61 *
Car Alarm Arming Horn Beep Canceller bob 142,841 6 *
Wireless Auto Tachometer 351,027 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,173 29 *
Parallel (Printer) Port Interface 296,533 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,841 63 *
3 Channel Spectrum Analyzer 231,061 20
40W Fluorescent Lamp Inverter Bart Milnes 337,698 60 *
Adjustable Strobe Light 318,358 36
Black Light 292,396 29
Colour (Sound) Organ 300,052 36
Electronic Dice NEW! 196,957 10 *
Fantastic Atom Expander 209,627 25
Flash Slave Trigger 229,413 18 *
Infa-Red Remote Control 647,658 216 *
IR Remote Extender NEW! 140,517 3 *
IR Remote Jammer Carl 275,216 110 *
IR Remote Switch NEW! 164,868 9 *
LASER Transmitter/Receiver 427,131 92
LED Chaser 456,470 83 *
LED Metronome NEW! 106,673 3 *
LED Thermometer 213,907 22 *
Light/Dark Detector 313,247 90 *
Simple Colour Organ 144,216 11 *
Strobe Light 283,143 27 *
TRIAC Light Dimmer 563,054 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,256 122 *
Electromagnetic Levitator NEW! 151,554 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,692 214 *
AC Motor Speed Controller 403,688 29 *
Air Flow Detector 259,314 54 *
Digital Keypad Combination Lock 209,149 20
Low Voltage Alarm 237,017 58 *
Pine Racecar Victory Judge 109,126 1 *
Pulse Width Modulation DC Motor Control 665,327 94
Rain Detector 312,875 112 *
Simple Lie Detector 574,726 323
Simple Polarity Tester Dudley LeRoux 172,817 13 *
Simple Servo Controller 229,846 22 *
Simple Touch Switch NEW! 177,895 6 *
Simple Two Speed Contactor DC Motor Controller 213,251 21 *
Stepper Motor Controller 763,163 120 *
Time Delay Relay 565,168 88
Time Delay Relay II jawaharlal@excite.com 255,459 39 *
Touch Switch 298,225 51 *
Video Activated Relay 128,712 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,721 10 *
Water Detector With Sump/Bilge Pump Controller 160,222 18 *
Wire Loop Alarm Alex Meaden 212,940 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 329,226 25 *
12VDC To 120VAC Inverter 1,554,366 691
6V to 12V Converter 538,774 121
Automatic 12V Lead Acid Battery Charger 948,796 248
Automatic Load Sensing Power Switch 175,347 16 *
Car Battery Charger 894,067 159 *
Dual Polarity Power Supply 380,775 84 *
Fixed Voltage Power Supply 319,984 52 *
High Current Power Supply 350,723 66 *
High Voltage High Current Power Supply 272,650 35 *
LASER Power Supply 305,439 28
Portable CD Player Adapter For Car 219,923 12 *
Power Supply 749,615 259 *
Solid State Tesla Coil NEW! 156,110 4
Solid State Tesla Coil/High Voltage Generator 456,416 51
Transformerless Power Supply 472,551 117 *
Voltage Inverter 352,397 51 *
Voltage Inverter II 211,867 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,766 182
3 Watt FM Transmitter Rae XL Tkacik 348,053 83 *
50 Watt Amplifier 518,976 74
8 Note Tune Player 147,974 12 *
8 Watt Audio Amp 385,050 67 *
Aircraft Radio Communications Receiver 289,909 50 *
Crystal Radio 168,641 53 *
Digital Volume Control 348,534 47 *
Electronic Stethoscope 331,628 142 *
FET Audio Mixer 352,961 41
FM Transmitter 1,026,805 420
Guitar Fuzz Effect 257,566 54 *
Microphone Mixer Anatoly I. Shikhatov 259,372 26 *
Mono To Stereo Synthesizer oRbEq 142,917 18 *
One Tube Regenerative Radio NEW! 158,693 4 *
Op Amp Radio 401,052 80 *
Single Chip AM Radio NEW! 107,733 4 *
Single Chip FM Radio NEW! 182,489 1 *
Sound Level Meter 351,161 51 *
Stereo Tube Amplifier Weslee Kinsler 277,470 15 *
Tone Control 319,333 31
Transistor Organ 208,961 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,468 27 *
FM Telephone Bug 242,081 57
Phone Busy Indicator 221,264 24 *
Remote Telephone Ringer 124,894 3 *
Ringing Phone Light Flasher 228,012 35 *
Simple Phone Tap Derek Tombrello 391,352 98 *
Telephone Hold Button 136,157 10
Telephone Recorder 223,969 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.