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, August 11, 2026		 12VDC To 120VAC Inverter39
Time Delay Relay II37
Yesterday
Monday, August 10, 2026		 12VDC To 120VAC Inverter41
FM Transmitter26
Of All Time 12VDC To 120VAC Inverter1,567,451
FM Transmitter1,037,182

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,210 61 *
Car Alarm Arming Horn Beep Canceller bob 146,744 6 *
Wireless Auto Tachometer 355,861 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 169,790 29 *
Parallel (Printer) Port Interface 302,225 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 462,420 63 *
3 Channel Spectrum Analyzer 236,124 20
40W Fluorescent Lamp Inverter Bart Milnes 342,178 60 *
Adjustable Strobe Light 323,311 36
Black Light 298,499 29
Colour (Sound) Organ 305,627 36
Electronic Dice NEW! 201,800 10 *
Fantastic Atom Expander 213,769 25
Flash Slave Trigger 234,350 18 *
Infa-Red Remote Control 653,635 216 *
IR Remote Extender NEW! 145,099 3 *
IR Remote Jammer Carl 280,486 110 *
IR Remote Switch NEW! 169,329 9 *
LASER Transmitter/Receiver 432,650 92
LED Chaser 462,552 83 *
LED Metronome NEW! 111,272 3 *
LED Thermometer 217,894 22 *
Light/Dark Detector 317,410 90 *
Simple Colour Organ 148,252 11 *
Strobe Light 287,391 27 *
TRIAC Light Dimmer 569,509 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 375,306 122 *
Electromagnetic Levitator NEW! 155,756 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 942,701 214 *
AC Motor Speed Controller 409,903 29 *
Air Flow Detector 263,975 54 *
Digital Keypad Combination Lock 213,443 20
Low Voltage Alarm 241,798 58 *
Pine Racecar Victory Judge 113,036 1 *
Pulse Width Modulation DC Motor Control 671,002 94
Rain Detector 317,804 112 *
Simple Lie Detector 580,184 323
Simple Polarity Tester Dudley LeRoux 177,703 13 *
Simple Servo Controller 234,582 22 *
Simple Touch Switch NEW! 182,751 6 *
Simple Two Speed Contactor DC Motor Controller 218,134 21 *
Stepper Motor Controller 770,876 120 *
Time Delay Relay 570,468 88
Time Delay Relay II jawaharlal@excite.com 260,236 39 *
Touch Switch 303,024 51 *
Video Activated Relay 132,669 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 196,097 10 *
Water Detector With Sump/Bilge Pump Controller 164,956 18 *
Wire Loop Alarm Alex Meaden 217,088 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 337,041 25 *
12VDC To 120VAC Inverter 1,567,451 691
6V to 12V Converter 545,155 121
Automatic 12V Lead Acid Battery Charger 956,033 248
Automatic Load Sensing Power Switch 179,988 16 *
Car Battery Charger 899,952 159 *
Dual Polarity Power Supply 386,590 84 *
Fixed Voltage Power Supply 324,366 52 *
High Current Power Supply 356,675 66 *
High Voltage High Current Power Supply 277,616 35 *
LASER Power Supply 310,473 28
Portable CD Player Adapter For Car 224,741 12 *
Power Supply 755,570 259 *
Solid State Tesla Coil NEW! 162,113 4
Solid State Tesla Coil/High Voltage Generator 463,886 51
Transformerless Power Supply 477,745 117 *
Voltage Inverter 359,084 51 *
Voltage Inverter II 216,716 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 599,691 182
3 Watt FM Transmitter Rae XL Tkacik 354,541 83 *
50 Watt Amplifier 524,453 74
8 Note Tune Player 152,141 12 *
8 Watt Audio Amp 391,503 67 *
Aircraft Radio Communications Receiver 295,699 50 *
Crystal Radio 174,923 53 *
Digital Volume Control 353,875 47 *
Electronic Stethoscope 337,450 142 *
FET Audio Mixer 357,821 41
FM Transmitter 1,037,182 420
Guitar Fuzz Effect 263,709 54 *
Microphone Mixer Anatoly I. Shikhatov 264,121 26 *
Mono To Stereo Synthesizer oRbEq 148,027 18 *
One Tube Regenerative Radio NEW! 166,045 4 *
Op Amp Radio 406,895 80 *
Single Chip AM Radio NEW! 112,510 4 *
Single Chip FM Radio NEW! 188,206 1 *
Sound Level Meter 356,366 51 *
Stereo Tube Amplifier Weslee Kinsler 283,048 15 *
Tone Control 324,733 31
Transistor Organ 214,109 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,456 27 *
FM Telephone Bug 246,009 57
Phone Busy Indicator 225,617 24 *
Remote Telephone Ringer 128,954 3 *
Ringing Phone Light Flasher 233,651 35 *
Simple Phone Tap Derek Tombrello 395,580 98 *
Telephone Hold Button 139,902 10
Telephone Recorder 227,925 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.