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 01, 2026		 Colour (Sound) Organ3
Mono To Stereo Synthesizer2
Yesterday
Monday, August 31, 2026		 Pulse Width Modulation DC Motor Control80
Solid State Tesla Coil65
Of All Time 12VDC To 120VAC Inverter1,568,562
FM Transmitter1,037,902

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,616 61 *
Car Alarm Arming Horn Beep Canceller bob 147,147 6 *
Wireless Auto Tachometer 356,312 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,199 29 *
Parallel (Printer) Port Interface 302,787 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 462,928 63 *
3 Channel Spectrum Analyzer 236,655 20
40W Fluorescent Lamp Inverter Bart Milnes 342,631 60 *
Adjustable Strobe Light 323,855 36
Black Light 299,066 29
Colour (Sound) Organ 306,185 36
Electronic Dice NEW! 202,275 10 *
Fantastic Atom Expander 214,232 25
Flash Slave Trigger 234,908 18 *
Infa-Red Remote Control 654,191 216 *
IR Remote Extender NEW! 145,618 3 *
IR Remote Jammer Carl 281,000 110 *
IR Remote Switch NEW! 169,781 9 *
LASER Transmitter/Receiver 433,105 92
LED Chaser 463,104 83 *
LED Metronome NEW! 111,722 3 *
LED Thermometer 218,328 22 *
Light/Dark Detector 317,881 90 *
Simple Colour Organ 148,748 11 *
Strobe Light 287,871 27 *
TRIAC Light Dimmer 570,044 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 375,854 122 *
Electromagnetic Levitator NEW! 156,189 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 943,264 214 *
AC Motor Speed Controller 410,471 29 *
Air Flow Detector 264,436 54 *
Digital Keypad Combination Lock 213,873 20
Low Voltage Alarm 242,249 58 *
Pine Racecar Victory Judge 113,435 1 *
Pulse Width Modulation DC Motor Control 671,576 94
Rain Detector 318,276 112 *
Simple Lie Detector 580,649 323
Simple Polarity Tester Dudley LeRoux 178,182 13 *
Simple Servo Controller 235,032 22 *
Simple Touch Switch NEW! 183,209 6 *
Simple Two Speed Contactor DC Motor Controller 218,644 21 *
Stepper Motor Controller 771,615 120 *
Time Delay Relay 571,067 88
Time Delay Relay II jawaharlal@excite.com 260,695 39 *
Touch Switch 303,491 51 *
Video Activated Relay 133,162 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 196,651 10 *
Water Detector With Sump/Bilge Pump Controller 165,375 18 *
Wire Loop Alarm Alex Meaden 217,562 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 337,806 25 *
12VDC To 120VAC Inverter 1,568,562 691
6V to 12V Converter 545,728 121
Automatic 12V Lead Acid Battery Charger 956,654 248
Automatic Load Sensing Power Switch 180,510 16 *
Car Battery Charger 900,493 159 *
Dual Polarity Power Supply 386,918 84 *
Fixed Voltage Power Supply 324,577 52 *
High Current Power Supply 356,982 66 *
High Voltage High Current Power Supply 277,837 35 *
LASER Power Supply 310,713 28
Portable CD Player Adapter For Car 224,997 12 *
Power Supply 755,879 259 *
Solid State Tesla Coil NEW! 162,491 4
Solid State Tesla Coil/High Voltage Generator 464,314 51
Transformerless Power Supply 477,993 117 *
Voltage Inverter 359,447 51 *
Voltage Inverter II 216,968 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 599,932 182
3 Watt FM Transmitter Rae XL Tkacik 354,898 83 *
50 Watt Amplifier 524,759 74
8 Note Tune Player 152,369 12 *
8 Watt Audio Amp 391,841 67 *
Aircraft Radio Communications Receiver 296,045 50 *
Crystal Radio 175,171 53 *
Digital Volume Control 354,151 47 *
Electronic Stethoscope 337,952 142 *
FET Audio Mixer 358,044 41
FM Transmitter 1,037,902 420
Guitar Fuzz Effect 264,014 54 *
Microphone Mixer Anatoly I. Shikhatov 264,352 26 *
Mono To Stereo Synthesizer oRbEq 148,268 18 *
One Tube Regenerative Radio NEW! 166,390 4 *
Op Amp Radio 407,223 80 *
Single Chip AM Radio NEW! 112,774 4 *
Single Chip FM Radio NEW! 188,659 1 *
Sound Level Meter 356,624 51 *
Stereo Tube Amplifier Weslee Kinsler 283,284 15 *
Tone Control 325,019 31
Transistor Organ 214,384 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,685 27 *
FM Telephone Bug 246,216 57
Phone Busy Indicator 225,833 24 *
Remote Telephone Ringer 129,151 3 *
Ringing Phone Light Flasher 233,912 35 *
Simple Phone Tap Derek Tombrello 395,812 98 *
Telephone Hold Button 140,091 10
Telephone Recorder 228,197 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.