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
Monday, September 15, 2025		 12VDC To 120VAC Inverter43
12VDC To 120VAC Inverter43
Yesterday
Sunday, September 14, 2025		 12VDC To 120VAC Inverter61
LED Chaser42
Of All Time 12VDC To 120VAC Inverter1,553,047
FM Transmitter1,025,683

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,617 61 *
Car Alarm Arming Horn Beep Canceller bob 142,440 6 *
Wireless Auto Tachometer 350,508 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,779 29 *
Parallel (Printer) Port Interface 295,659 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,242 63 *
3 Channel Spectrum Analyzer 230,456 20
40W Fluorescent Lamp Inverter Bart Milnes 337,181 60 *
Adjustable Strobe Light 317,789 36
Black Light 291,726 29
Colour (Sound) Organ 299,439 36
Electronic Dice NEW! 196,406 10 *
Fantastic Atom Expander 209,187 25
Flash Slave Trigger 228,881 18 *
Infa-Red Remote Control 646,991 216 *
IR Remote Extender NEW! 139,992 3 *
IR Remote Jammer Carl 274,630 110 *
IR Remote Switch NEW! 164,352 9 *
LASER Transmitter/Receiver 426,567 92
LED Chaser 455,620 83 *
LED Metronome NEW! 106,199 3 *
LED Thermometer 213,461 22 *
Light/Dark Detector 312,737 90 *
Simple Colour Organ 143,732 11 *
Strobe Light 282,665 27 *
TRIAC Light Dimmer 562,450 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 368,522 122 *
Electromagnetic Levitator NEW! 151,098 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 933,855 214 *
AC Motor Speed Controller 402,812 29 *
Air Flow Detector 258,862 54 *
Digital Keypad Combination Lock 208,650 20
Low Voltage Alarm 236,495 58 *
Pine Racecar Victory Judge 108,692 1 *
Pulse Width Modulation DC Motor Control 664,703 94
Rain Detector 312,385 112 *
Simple Lie Detector 573,986 323
Simple Polarity Tester Dudley LeRoux 172,305 13 *
Simple Servo Controller 229,261 22 *
Simple Touch Switch NEW! 177,337 6 *
Simple Two Speed Contactor DC Motor Controller 212,710 21 *
Stepper Motor Controller 762,138 120 *
Time Delay Relay 564,571 88
Time Delay Relay II jawaharlal@excite.com 254,914 39 *
Touch Switch 297,680 51 *
Video Activated Relay 128,251 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,150 10 *
Water Detector With Sump/Bilge Pump Controller 159,770 18 *
Wire Loop Alarm Alex Meaden 212,441 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 327,965 25 *
12VDC To 120VAC Inverter 1,553,047 691
6V to 12V Converter 538,117 121
Automatic 12V Lead Acid Battery Charger 948,079 248
Automatic Load Sensing Power Switch 174,836 16 *
Car Battery Charger 893,331 159 *
Dual Polarity Power Supply 380,119 84 *
Fixed Voltage Power Supply 319,505 52 *
High Current Power Supply 350,043 66 *
High Voltage High Current Power Supply 272,107 35 *
LASER Power Supply 304,936 28
Portable CD Player Adapter For Car 219,442 12 *
Power Supply 749,034 259 *
Solid State Tesla Coil NEW! 155,390 4
Solid State Tesla Coil/High Voltage Generator 455,680 51
Transformerless Power Supply 471,978 117 *
Voltage Inverter 351,622 51 *
Voltage Inverter II 211,363 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,197 182
3 Watt FM Transmitter Rae XL Tkacik 347,335 83 *
50 Watt Amplifier 518,318 74
8 Note Tune Player 147,529 12 *
8 Watt Audio Amp 384,211 67 *
Aircraft Radio Communications Receiver 289,233 50 *
Crystal Radio 167,924 53 *
Digital Volume Control 347,954 47 *
Electronic Stethoscope 330,975 142 *
FET Audio Mixer 352,430 41
FM Transmitter 1,025,683 420
Guitar Fuzz Effect 256,896 54 *
Microphone Mixer Anatoly I. Shikhatov 258,777 26 *
Mono To Stereo Synthesizer oRbEq 142,346 18 *
One Tube Regenerative Radio NEW! 157,708 4 *
Op Amp Radio 400,379 80 *
Single Chip AM Radio NEW! 107,241 4 *
Single Chip FM Radio NEW! 181,767 1 *
Sound Level Meter 350,584 51 *
Stereo Tube Amplifier Weslee Kinsler 276,787 15 *
Tone Control 318,659 31
Transistor Organ 208,387 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,026 27 *
FM Telephone Bug 241,621 57
Phone Busy Indicator 220,782 24 *
Remote Telephone Ringer 124,457 3 *
Ringing Phone Light Flasher 227,322 35 *
Simple Phone Tap Derek Tombrello 390,867 98 *
Telephone Hold Button 135,743 10
Telephone Recorder 223,510 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.