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 14, 2026		 Solid State Tesla Coil/High Voltage Generator6
Touch Switch6
Yesterday
Sunday, September 13, 2026		 FM Transmitter35
Automatic 12V Lead Acid Battery Charger26
Of All Time 12VDC To 120VAC Inverter1,569,062
FM Transmitter1,038,337

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,781 61 *
Car Alarm Arming Horn Beep Canceller bob 147,290 6 *
Wireless Auto Tachometer 356,509 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,361 29 *
Parallel (Printer) Port Interface 303,134 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 463,158 63 *
3 Channel Spectrum Analyzer 236,915 20
40W Fluorescent Lamp Inverter Bart Milnes 342,804 60 *
Adjustable Strobe Light 324,056 36
Black Light 299,301 29
Colour (Sound) Organ 306,422 36
Electronic Dice NEW! 202,478 10 *
Fantastic Atom Expander 214,394 25
Flash Slave Trigger 235,119 18 *
Infa-Red Remote Control 654,533 216 *
IR Remote Extender NEW! 145,814 3 *
IR Remote Jammer Carl 281,192 110 *
IR Remote Switch NEW! 169,983 9 *
LASER Transmitter/Receiver 433,323 92
LED Chaser 463,448 83 *
LED Metronome NEW! 111,919 3 *
LED Thermometer 218,498 22 *
Light/Dark Detector 318,050 90 *
Simple Colour Organ 148,948 11 *
Strobe Light 288,057 27 *
TRIAC Light Dimmer 570,326 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 376,044 122 *
Electromagnetic Levitator NEW! 156,317 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 943,648 214 *
AC Motor Speed Controller 410,693 29 *
Air Flow Detector 264,619 54 *
Digital Keypad Combination Lock 214,047 20
Low Voltage Alarm 242,447 58 *
Pine Racecar Victory Judge 113,663 1 *
Pulse Width Modulation DC Motor Control 671,865 94
Rain Detector 318,462 112 *
Simple Lie Detector 580,854 323
Simple Polarity Tester Dudley LeRoux 178,380 13 *
Simple Servo Controller 235,323 22 *
Simple Touch Switch NEW! 183,405 6 *
Simple Two Speed Contactor DC Motor Controller 218,800 21 *
Stepper Motor Controller 771,917 120 *
Time Delay Relay 571,326 88
Time Delay Relay II jawaharlal@excite.com 260,869 39 *
Touch Switch 303,698 51 *
Video Activated Relay 133,346 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 196,859 10 *
Water Detector With Sump/Bilge Pump Controller 165,555 18 *
Wire Loop Alarm Alex Meaden 217,744 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 338,147 25 *
12VDC To 120VAC Inverter 1,569,062 691
6V to 12V Converter 545,965 121
Automatic 12V Lead Acid Battery Charger 956,912 248
Automatic Load Sensing Power Switch 180,692 16 *
Car Battery Charger 900,690 159 *
Dual Polarity Power Supply 387,203 84 *
Fixed Voltage Power Supply 324,756 52 *
High Current Power Supply 357,189 66 *
High Voltage High Current Power Supply 278,011 35 *
LASER Power Supply 310,931 28
Portable CD Player Adapter For Car 225,183 12 *
Power Supply 756,125 259 *
Solid State Tesla Coil NEW! 162,723 4
Solid State Tesla Coil/High Voltage Generator 464,671 51
Transformerless Power Supply 478,166 117 *
Voltage Inverter 359,740 51 *
Voltage Inverter II 217,154 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,134 182
3 Watt FM Transmitter Rae XL Tkacik 355,146 83 *
50 Watt Amplifier 524,983 74
8 Note Tune Player 152,600 12 *
8 Watt Audio Amp 392,119 67 *
Aircraft Radio Communications Receiver 296,284 50 *
Crystal Radio 175,402 53 *
Digital Volume Control 354,391 47 *
Electronic Stethoscope 338,181 142 *
FET Audio Mixer 358,253 41
FM Transmitter 1,038,337 420
Guitar Fuzz Effect 264,218 54 *
Microphone Mixer Anatoly I. Shikhatov 264,576 26 *
Mono To Stereo Synthesizer oRbEq 148,457 18 *
One Tube Regenerative Radio NEW! 166,691 4 *
Op Amp Radio 407,476 80 *
Single Chip AM Radio NEW! 112,988 4 *
Single Chip FM Radio NEW! 188,911 1 *
Sound Level Meter 356,829 51 *
Stereo Tube Amplifier Weslee Kinsler 283,464 15 *
Tone Control 325,267 31
Transistor Organ 214,607 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,869 27 *
FM Telephone Bug 246,414 57
Phone Busy Indicator 226,058 24 *
Remote Telephone Ringer 129,308 3 *
Ringing Phone Light Flasher 234,109 35 *
Simple Phone Tap Derek Tombrello 395,988 98 *
Telephone Hold Button 140,262 10
Telephone Recorder 228,424 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.