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, September 27, 2026		 3 Channel Spectrum Analyzer2
Crystal Radio2
Yesterday
Saturday, September 26, 2026		 Transistor Organ46
FM Transmitter44
Of All Time 12VDC To 120VAC Inverter1,569,546
FM Transmitter1,038,703

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,931 61 *
Car Alarm Arming Horn Beep Canceller bob 147,425 6 *
Wireless Auto Tachometer 356,667 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,535 29 *
Parallel (Printer) Port Interface 303,357 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 463,382 63 *
3 Channel Spectrum Analyzer 237,098 20
40W Fluorescent Lamp Inverter Bart Milnes 342,955 60 *
Adjustable Strobe Light 324,256 36
Black Light 299,506 29
Colour (Sound) Organ 306,663 36
Electronic Dice NEW! 202,664 10 *
Fantastic Atom Expander 214,560 25
Flash Slave Trigger 235,330 18 *
Infa-Red Remote Control 654,764 216 *
IR Remote Extender NEW! 146,000 3 *
IR Remote Jammer Carl 281,362 110 *
IR Remote Switch NEW! 170,159 9 *
LASER Transmitter/Receiver 433,492 92
LED Chaser 463,675 83 *
LED Metronome NEW! 112,079 3 *
LED Thermometer 218,650 22 *
Light/Dark Detector 318,202 90 *
Simple Colour Organ 149,114 11 *
Strobe Light 288,224 27 *
TRIAC Light Dimmer 570,532 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 376,281 122 *
Electromagnetic Levitator NEW! 156,468 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 943,873 214 *
AC Motor Speed Controller 410,884 29 *
Air Flow Detector 264,782 54 *
Digital Keypad Combination Lock 214,198 20
Low Voltage Alarm 242,627 58 *
Pine Racecar Victory Judge 113,812 1 *
Pulse Width Modulation DC Motor Control 672,075 94
Rain Detector 318,627 112 *
Simple Lie Detector 581,032 323
Simple Polarity Tester Dudley LeRoux 178,539 13 *
Simple Servo Controller 235,494 22 *
Simple Touch Switch NEW! 183,587 6 *
Simple Two Speed Contactor DC Motor Controller 218,984 21 *
Stepper Motor Controller 772,178 120 *
Time Delay Relay 571,523 88
Time Delay Relay II jawaharlal@excite.com 261,029 39 *
Touch Switch 303,904 51 *
Video Activated Relay 133,512 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 197,124 10 *
Water Detector With Sump/Bilge Pump Controller 165,691 18 *
Wire Loop Alarm Alex Meaden 217,938 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 338,404 25 *
12VDC To 120VAC Inverter 1,569,546 691
6V to 12V Converter 546,207 121
Automatic 12V Lead Acid Battery Charger 957,165 248
Automatic Load Sensing Power Switch 180,841 16 *
Car Battery Charger 900,917 159 *
Dual Polarity Power Supply 387,397 84 *
Fixed Voltage Power Supply 324,941 52 *
High Current Power Supply 357,414 66 *
High Voltage High Current Power Supply 278,157 35 *
LASER Power Supply 311,116 28
Portable CD Player Adapter For Car 225,370 12 *
Power Supply 756,349 259 *
Solid State Tesla Coil NEW! 162,912 4
Solid State Tesla Coil/High Voltage Generator 464,893 51
Transformerless Power Supply 478,331 117 *
Voltage Inverter 359,998 51 *
Voltage Inverter II 217,349 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,295 182
3 Watt FM Transmitter Rae XL Tkacik 355,370 83 *
50 Watt Amplifier 525,202 74
8 Note Tune Player 152,733 12 *
8 Watt Audio Amp 392,314 67 *
Aircraft Radio Communications Receiver 296,478 50 *
Crystal Radio 175,582 53 *
Digital Volume Control 354,599 47 *
Electronic Stethoscope 338,357 142 *
FET Audio Mixer 358,434 41
FM Transmitter 1,038,703 420
Guitar Fuzz Effect 264,416 54 *
Microphone Mixer Anatoly I. Shikhatov 264,761 26 *
Mono To Stereo Synthesizer oRbEq 148,657 18 *
One Tube Regenerative Radio NEW! 166,910 4 *
Op Amp Radio 407,708 80 *
Single Chip AM Radio NEW! 113,134 4 *
Single Chip FM Radio NEW! 189,157 1 *
Sound Level Meter 357,054 51 *
Stereo Tube Amplifier Weslee Kinsler 283,636 15 *
Tone Control 325,465 31
Transistor Organ 215,072 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 175,009 27 *
FM Telephone Bug 246,583 57
Phone Busy Indicator 226,230 24 *
Remote Telephone Ringer 129,442 3 *
Ringing Phone Light Flasher 234,293 35 *
Simple Phone Tap Derek Tombrello 396,147 98 *
Telephone Hold Button 140,401 10
Telephone Recorder 228,578 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.