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
Saturday, October 25, 2025		 8 Watt Audio Amp3
Mono To Stereo Synthesizer2
Yesterday
Friday, October 24, 2025		 FM Transmitter66
Stepper Motor Controller50
Of All Time 12VDC To 120VAC Inverter1,554,799
FM Transmitter1,027,159

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,233 61 *
Car Alarm Arming Horn Beep Canceller bob 142,968 6 *
Wireless Auto Tachometer 351,193 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,292 29 *
Parallel (Printer) Port Interface 296,712 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,014 63 *
3 Channel Spectrum Analyzer 231,219 20
40W Fluorescent Lamp Inverter Bart Milnes 337,836 60 *
Adjustable Strobe Light 318,521 36
Black Light 292,605 29
Colour (Sound) Organ 300,235 36
Electronic Dice NEW! 197,129 10 *
Fantastic Atom Expander 209,770 25
Flash Slave Trigger 229,592 18 *
Infa-Red Remote Control 647,870 216 *
IR Remote Extender NEW! 140,670 3 *
IR Remote Jammer Carl 275,381 110 *
IR Remote Switch NEW! 165,019 9 *
LASER Transmitter/Receiver 427,316 92
LED Chaser 456,698 83 *
LED Metronome NEW! 106,839 3 *
LED Thermometer 214,038 22 *
Light/Dark Detector 313,394 90 *
Simple Colour Organ 144,347 11 *
Strobe Light 283,276 27 *
TRIAC Light Dimmer 563,244 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,429 122 *
Electromagnetic Levitator NEW! 151,691 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 934,948 214 *
AC Motor Speed Controller 403,926 29 *
Air Flow Detector 259,454 54 *
Digital Keypad Combination Lock 209,275 20
Low Voltage Alarm 237,189 58 *
Pine Racecar Victory Judge 109,243 1 *
Pulse Width Modulation DC Motor Control 665,507 94
Rain Detector 313,026 112 *
Simple Lie Detector 574,926 323
Simple Polarity Tester Dudley LeRoux 172,991 13 *
Simple Servo Controller 229,986 22 *
Simple Touch Switch NEW! 178,073 6 *
Simple Two Speed Contactor DC Motor Controller 213,401 21 *
Stepper Motor Controller 763,463 120 *
Time Delay Relay 565,347 88
Time Delay Relay II jawaharlal@excite.com 255,595 39 *
Touch Switch 298,366 51 *
Video Activated Relay 128,827 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,888 10 *
Water Detector With Sump/Bilge Pump Controller 160,355 18 *
Wire Loop Alarm Alex Meaden 213,079 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 329,540 25 *
12VDC To 120VAC Inverter 1,554,799 691
6V to 12V Converter 538,987 121
Automatic 12V Lead Acid Battery Charger 948,991 248
Automatic Load Sensing Power Switch 175,515 16 *
Car Battery Charger 894,259 159 *
Dual Polarity Power Supply 380,976 84 *
Fixed Voltage Power Supply 320,122 52 *
High Current Power Supply 350,916 66 *
High Voltage High Current Power Supply 272,800 35 *
LASER Power Supply 305,585 28
Portable CD Player Adapter For Car 220,062 12 *
Power Supply 749,818 259 *
Solid State Tesla Coil NEW! 156,300 4
Solid State Tesla Coil/High Voltage Generator 456,632 51
Transformerless Power Supply 472,709 117 *
Voltage Inverter 352,694 51 *
Voltage Inverter II 212,016 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,909 182
3 Watt FM Transmitter Rae XL Tkacik 348,280 83 *
50 Watt Amplifier 519,162 74
8 Note Tune Player 148,086 12 *
8 Watt Audio Amp 385,250 67 *
Aircraft Radio Communications Receiver 290,082 50 *
Crystal Radio 168,852 53 *
Digital Volume Control 348,699 47 *
Electronic Stethoscope 331,823 142 *
FET Audio Mixer 353,099 41
FM Transmitter 1,027,159 420
Guitar Fuzz Effect 257,777 54 *
Microphone Mixer Anatoly I. Shikhatov 259,523 26 *
Mono To Stereo Synthesizer oRbEq 143,061 18 *
One Tube Regenerative Radio NEW! 158,957 4 *
Op Amp Radio 401,275 80 *
Single Chip AM Radio NEW! 107,861 4 *
Single Chip FM Radio NEW! 182,693 1 *
Sound Level Meter 351,322 51 *
Stereo Tube Amplifier Weslee Kinsler 277,687 15 *
Tone Control 319,509 31
Transistor Organ 209,145 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,584 27 *
FM Telephone Bug 242,203 57
Phone Busy Indicator 221,398 24 *
Remote Telephone Ringer 125,004 3 *
Ringing Phone Light Flasher 228,177 35 *
Simple Phone Tap Derek Tombrello 391,503 98 *
Telephone Hold Button 136,266 10
Telephone Recorder 224,098 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.