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
Tuesday, September 29, 2026		 Power Supply7
Electronic Dice7
Yesterday
Monday, September 28, 2026		 Black Light71
Solid State Tesla Coil63
Of All Time 12VDC To 120VAC Inverter1,569,608
FM Transmitter1,038,797

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,953 61 *
Car Alarm Arming Horn Beep Canceller bob 147,445 6 *
Wireless Auto Tachometer 356,694 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,552 29 *
Parallel (Printer) Port Interface 303,394 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 463,423 63 *
3 Channel Spectrum Analyzer 237,128 20
40W Fluorescent Lamp Inverter Bart Milnes 342,978 60 *
Adjustable Strobe Light 324,346 36
Black Light 299,594 29
Colour (Sound) Organ 306,689 36
Electronic Dice NEW! 202,698 10 *
Fantastic Atom Expander 214,590 25
Flash Slave Trigger 235,406 18 *
Infa-Red Remote Control 654,843 216 *
IR Remote Extender NEW! 146,076 3 *
IR Remote Jammer Carl 281,389 110 *
IR Remote Switch NEW! 170,193 9 *
LASER Transmitter/Receiver 433,527 92
LED Chaser 463,707 83 *
LED Metronome NEW! 112,108 3 *
LED Thermometer 218,681 22 *
Light/Dark Detector 318,277 90 *
Simple Colour Organ 149,189 11 *
Strobe Light 288,307 27 *
TRIAC Light Dimmer 570,559 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 376,325 122 *
Electromagnetic Levitator NEW! 156,501 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 943,909 214 *
AC Motor Speed Controller 410,913 29 *
Air Flow Detector 264,809 54 *
Digital Keypad Combination Lock 214,222 20
Low Voltage Alarm 242,658 58 *
Pine Racecar Victory Judge 113,888 1 *
Pulse Width Modulation DC Motor Control 672,155 94
Rain Detector 318,665 112 *
Simple Lie Detector 581,063 323
Simple Polarity Tester Dudley LeRoux 178,575 13 *
Simple Servo Controller 235,571 22 *
Simple Touch Switch NEW! 183,622 6 *
Simple Two Speed Contactor DC Motor Controller 219,017 21 *
Stepper Motor Controller 772,232 120 *
Time Delay Relay 571,602 88
Time Delay Relay II jawaharlal@excite.com 261,060 39 *
Touch Switch 303,940 51 *
Video Activated Relay 133,604 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 197,179 10 *
Water Detector With Sump/Bilge Pump Controller 165,714 18 *
Wire Loop Alarm Alex Meaden 217,972 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 338,431 25 *
12VDC To 120VAC Inverter 1,569,608 691
6V to 12V Converter 546,240 121
Automatic 12V Lead Acid Battery Charger 957,199 248
Automatic Load Sensing Power Switch 180,920 16 *
Car Battery Charger 900,960 159 *
Dual Polarity Power Supply 387,482 84 *
Fixed Voltage Power Supply 324,964 52 *
High Current Power Supply 357,447 66 *
High Voltage High Current Power Supply 278,181 35 *
LASER Power Supply 311,153 28
Portable CD Player Adapter For Car 225,403 12 *
Power Supply 756,391 259 *
Solid State Tesla Coil NEW! 162,997 4
Solid State Tesla Coil/High Voltage Generator 464,972 51
Transformerless Power Supply 478,372 117 *
Voltage Inverter 360,043 51 *
Voltage Inverter II 217,380 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,329 182
3 Watt FM Transmitter Rae XL Tkacik 355,450 83 *
50 Watt Amplifier 525,234 74
8 Note Tune Player 152,806 12 *
8 Watt Audio Amp 392,353 67 *
Aircraft Radio Communications Receiver 296,518 50 *
Crystal Radio 175,617 53 *
Digital Volume Control 354,636 47 *
Electronic Stethoscope 338,387 142 *
FET Audio Mixer 358,475 41
FM Transmitter 1,038,797 420
Guitar Fuzz Effect 264,453 54 *
Microphone Mixer Anatoly I. Shikhatov 264,842 26 *
Mono To Stereo Synthesizer oRbEq 148,695 18 *
One Tube Regenerative Radio NEW! 167,008 4 *
Op Amp Radio 407,751 80 *
Single Chip AM Radio NEW! 113,215 4 *
Single Chip FM Radio NEW! 189,247 1 *
Sound Level Meter 357,092 51 *
Stereo Tube Amplifier Weslee Kinsler 283,670 15 *
Tone Control 325,532 31
Transistor Organ 215,124 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 175,044 27 *
FM Telephone Bug 246,607 57
Phone Busy Indicator 226,255 24 *
Remote Telephone Ringer 129,474 3 *
Ringing Phone Light Flasher 234,313 35 *
Simple Phone Tap Derek Tombrello 396,170 98 *
Telephone Hold Button 140,415 10
Telephone Recorder 228,656 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.