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, November 04, 2026		 12VDC To 120VAC Inverter10
Pulse Width Modulation DC Motor Control9
Yesterday
Tuesday, November 03, 2026		 7 Segment LED Counter39
12VDC To 120VAC Inverter38
Of All Time 12VDC To 120VAC Inverter1,571,087
FM Transmitter1,039,867

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 239,476 61 *
Car Alarm Arming Horn Beep Canceller bob 147,913 6 *
Wireless Auto Tachometer 357,321 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 171,089 29 *
Parallel (Printer) Port Interface 304,163 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 464,140 63 *
3 Channel Spectrum Analyzer 237,886 20
40W Fluorescent Lamp Inverter Bart Milnes 343,594 60 *
Adjustable Strobe Light 325,027 36
Black Light 300,426 29
Colour (Sound) Organ 307,526 36
Electronic Dice NEW! 203,372 10 *
Fantastic Atom Expander 215,221 25
Flash Slave Trigger 236,169 18 *
Infa-Red Remote Control 655,655 216 *
IR Remote Extender NEW! 146,734 3 *
IR Remote Jammer Carl 282,038 110 *
IR Remote Switch NEW! 170,907 9 *
LASER Transmitter/Receiver 434,204 92
LED Chaser 464,429 83 *
LED Metronome NEW! 112,708 3 *
LED Thermometer 219,190 22 *
Light/Dark Detector 318,831 90 *
Simple Colour Organ 149,766 11 *
Strobe Light 288,977 27 *
TRIAC Light Dimmer 571,329 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 377,088 122 *
Electromagnetic Levitator NEW! 157,066 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 944,963 214 *
AC Motor Speed Controller 411,652 29 *
Air Flow Detector 265,372 54 *
Digital Keypad Combination Lock 214,756 20
Low Voltage Alarm 243,230 58 *
Pine Racecar Victory Judge 114,485 1 *
Pulse Width Modulation DC Motor Control 672,987 94
Rain Detector 319,326 112 *
Simple Lie Detector 581,791 323
Simple Polarity Tester Dudley LeRoux 179,207 13 *
Simple Servo Controller 236,203 22 *
Simple Touch Switch NEW! 184,244 6 *
Simple Two Speed Contactor DC Motor Controller 219,688 21 *
Stepper Motor Controller 773,095 120 *
Time Delay Relay 572,297 88
Time Delay Relay II jawaharlal@excite.com 261,625 39 *
Touch Switch 304,631 51 *
Video Activated Relay 134,287 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 197,950 10 *
Water Detector With Sump/Bilge Pump Controller 166,260 18 *
Wire Loop Alarm Alex Meaden 218,619 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 339,244 25 *
12VDC To 120VAC Inverter 1,571,087 691
6V to 12V Converter 546,992 121
Automatic 12V Lead Acid Battery Charger 958,087 248
Automatic Load Sensing Power Switch 181,480 16 *
Car Battery Charger 901,654 159 *
Dual Polarity Power Supply 388,072 84 *
Fixed Voltage Power Supply 325,500 52 *
High Current Power Supply 358,102 66 *
High Voltage High Current Power Supply 278,723 35 *
LASER Power Supply 311,859 28
Portable CD Player Adapter For Car 226,041 12 *
Power Supply 757,165 259 *
Solid State Tesla Coil NEW! 163,726 4
Solid State Tesla Coil/High Voltage Generator 465,791 51
Transformerless Power Supply 479,021 117 *
Voltage Inverter 360,886 51 *
Voltage Inverter II 218,012 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,909 182
3 Watt FM Transmitter Rae XL Tkacik 356,116 83 *
50 Watt Amplifier 525,887 74
8 Note Tune Player 153,361 12 *
8 Watt Audio Amp 393,104 67 *
Aircraft Radio Communications Receiver 297,238 50 *
Crystal Radio 176,238 53 *
Digital Volume Control 355,326 47 *
Electronic Stethoscope 339,116 142 *
FET Audio Mixer 359,170 41
FM Transmitter 1,039,867 420
Guitar Fuzz Effect 265,204 54 *
Microphone Mixer Anatoly I. Shikhatov 265,413 26 *
Mono To Stereo Synthesizer oRbEq 149,351 18 *
One Tube Regenerative Radio NEW! 168,052 4 *
Op Amp Radio 408,623 80 *
Single Chip AM Radio NEW! 113,806 4 *
Single Chip FM Radio NEW! 190,040 1 *
Sound Level Meter 357,789 51 *
Stereo Tube Amplifier Weslee Kinsler 284,293 15 *
Tone Control 326,155 31
Transistor Organ 215,823 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 175,580 27 *
FM Telephone Bug 247,209 57
Phone Busy Indicator 226,880 24 *
Remote Telephone Ringer 130,041 3 *
Ringing Phone Light Flasher 234,972 35 *
Simple Phone Tap Derek Tombrello 396,754 98 *
Telephone Hold Button 140,935 10
Telephone Recorder 229,258 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.