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, November 10, 2026		 12VDC To 120VAC Inverter78
Sound Level Meter37
Yesterday
Monday, November 09, 2026		 12VDC To 120VAC Inverter40
Voltage Inverter34
Of All Time 12VDC To 120VAC Inverter1,571,404
FM Transmitter1,040,106

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 239,576 61 *
Car Alarm Arming Horn Beep Canceller bob 148,004 6 *
Wireless Auto Tachometer 357,440 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 171,180 29 *
Parallel (Printer) Port Interface 304,273 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 464,288 63 *
3 Channel Spectrum Analyzer 238,015 20
40W Fluorescent Lamp Inverter Bart Milnes 343,721 60 *
Adjustable Strobe Light 325,153 36
Black Light 300,576 29
Colour (Sound) Organ 307,660 36
Electronic Dice NEW! 203,523 10 *
Fantastic Atom Expander 215,345 25
Flash Slave Trigger 236,286 18 *
Infa-Red Remote Control 655,801 216 *
IR Remote Extender NEW! 146,857 3 *
IR Remote Jammer Carl 282,171 110 *
IR Remote Switch NEW! 171,024 9 *
LASER Transmitter/Receiver 434,331 92
LED Chaser 464,582 83 *
LED Metronome NEW! 112,817 3 *
LED Thermometer 219,292 22 *
Light/Dark Detector 318,934 90 *
Simple Colour Organ 149,888 11 *
Strobe Light 289,111 27 *
TRIAC Light Dimmer 571,473 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 377,222 122 *
Electromagnetic Levitator NEW! 157,159 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 945,135 214 *
AC Motor Speed Controller 411,780 29 *
Air Flow Detector 265,483 54 *
Digital Keypad Combination Lock 214,860 20
Low Voltage Alarm 243,358 58 *
Pine Racecar Victory Judge 114,608 1 *
Pulse Width Modulation DC Motor Control 673,239 94
Rain Detector 319,468 112 *
Simple Lie Detector 581,938 323
Simple Polarity Tester Dudley LeRoux 179,343 13 *
Simple Servo Controller 236,345 22 *
Simple Touch Switch NEW! 184,385 6 *
Simple Two Speed Contactor DC Motor Controller 219,825 21 *
Stepper Motor Controller 773,258 120 *
Time Delay Relay 572,466 88
Time Delay Relay II jawaharlal@excite.com 261,767 39 *
Touch Switch 304,770 51 *
Video Activated Relay 134,443 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 198,114 10 *
Water Detector With Sump/Bilge Pump Controller 166,377 18 *
Wire Loop Alarm Alex Meaden 218,743 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 339,415 25 *
12VDC To 120VAC Inverter 1,571,404 691
6V to 12V Converter 547,136 121
Automatic 12V Lead Acid Battery Charger 958,251 248
Automatic Load Sensing Power Switch 181,595 16 *
Car Battery Charger 901,784 159 *
Dual Polarity Power Supply 388,199 84 *
Fixed Voltage Power Supply 325,608 52 *
High Current Power Supply 358,241 66 *
High Voltage High Current Power Supply 278,834 35 *
LASER Power Supply 311,986 28
Portable CD Player Adapter For Car 226,178 12 *
Power Supply 757,372 259 *
Solid State Tesla Coil NEW! 163,846 4
Solid State Tesla Coil/High Voltage Generator 465,937 51
Transformerless Power Supply 479,151 117 *
Voltage Inverter 361,031 51 *
Voltage Inverter II 218,145 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 601,026 182
3 Watt FM Transmitter Rae XL Tkacik 356,257 83 *
50 Watt Amplifier 526,071 74
8 Note Tune Player 153,459 12 *
8 Watt Audio Amp 393,244 67 *
Aircraft Radio Communications Receiver 297,452 50 *
Crystal Radio 176,371 53 *
Digital Volume Control 355,457 47 *
Electronic Stethoscope 339,250 142 *
FET Audio Mixer 359,299 41
FM Transmitter 1,040,106 420
Guitar Fuzz Effect 265,343 54 *
Microphone Mixer Anatoly I. Shikhatov 265,538 26 *
Mono To Stereo Synthesizer oRbEq 149,545 18 *
One Tube Regenerative Radio NEW! 168,240 4 *
Op Amp Radio 408,789 80 *
Single Chip AM Radio NEW! 113,949 4 *
Single Chip FM Radio NEW! 190,196 1 *
Sound Level Meter 357,939 51 *
Stereo Tube Amplifier Weslee Kinsler 284,402 15 *
Tone Control 326,298 31
Transistor Organ 215,987 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 175,688 27 *
FM Telephone Bug 247,313 57
Phone Busy Indicator 226,983 24 *
Remote Telephone Ringer 130,143 3 *
Ringing Phone Light Flasher 235,098 35 *
Simple Phone Tap Derek Tombrello 396,858 98 *
Telephone Hold Button 141,018 10
Telephone Recorder 229,355 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.