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
Friday, June 20, 2025		 12VDC To 120VAC Inverter40
AC Motor Speed Controller39
Yesterday
Thursday, June 19, 2025		 Stepper Motor Controller50
Black Light40
Of All Time 12VDC To 120VAC Inverter1,549,141
FM Transmitter1,022,637

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,353 61 *
Car Alarm Arming Horn Beep Canceller bob 141,452 6 *
Wireless Auto Tachometer 349,182 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 164,789 29 *
Parallel (Printer) Port Interface 293,909 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 454,759 63 *
3 Channel Spectrum Analyzer 228,947 20
40W Fluorescent Lamp Inverter Bart Milnes 335,834 60 *
Adjustable Strobe Light 316,160 36
Black Light 290,066 29
Colour (Sound) Organ 297,688 36
Electronic Dice NEW! 195,071 10 *
Fantastic Atom Expander 208,094 25
Flash Slave Trigger 227,454 18 *
Infa-Red Remote Control 644,945 216 *
IR Remote Extender NEW! 138,673 3 *
IR Remote Jammer Carl 273,156 110 *
IR Remote Switch NEW! 163,030 9 *
LASER Transmitter/Receiver 424,852 92
LED Chaser 453,840 83 *
LED Metronome NEW! 104,968 3 *
LED Thermometer 212,294 22 *
Light/Dark Detector 311,536 90 *
Simple Colour Organ 142,547 11 *
Strobe Light 281,448 27 *
TRIAC Light Dimmer 560,914 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,055 122 *
Electromagnetic Levitator NEW! 149,896 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 931,891 214 *
AC Motor Speed Controller 400,689 29 *
Air Flow Detector 257,580 54 *
Digital Keypad Combination Lock 207,457 20
Low Voltage Alarm 235,070 58 *
Pine Racecar Victory Judge 107,642 1 *
Pulse Width Modulation DC Motor Control 662,757 94
Rain Detector 311,097 112 *
Simple Lie Detector 572,260 323
Simple Polarity Tester Dudley LeRoux 171,069 13 *
Simple Servo Controller 227,794 22 *
Simple Touch Switch NEW! 175,928 6 *
Simple Two Speed Contactor DC Motor Controller 211,329 21 *
Stepper Motor Controller 759,422 120 *
Time Delay Relay 562,970 88
Time Delay Relay II jawaharlal@excite.com 253,577 39 *
Touch Switch 296,186 51 *
Video Activated Relay 127,094 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 187,681 10 *
Water Detector With Sump/Bilge Pump Controller 158,602 18 *
Wire Loop Alarm Alex Meaden 211,200 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 325,749 25 *
12VDC To 120VAC Inverter 1,549,141 691
6V to 12V Converter 536,240 121
Automatic 12V Lead Acid Battery Charger 946,215 248
Automatic Load Sensing Power Switch 173,484 16 *
Car Battery Charger 891,440 159 *
Dual Polarity Power Supply 378,365 84 *
Fixed Voltage Power Supply 318,067 52 *
High Current Power Supply 348,104 66 *
High Voltage High Current Power Supply 270,633 35 *
LASER Power Supply 303,422 28
Portable CD Player Adapter For Car 218,173 12 *
Power Supply 747,401 259 *
Solid State Tesla Coil NEW! 153,668 4
Solid State Tesla Coil/High Voltage Generator 453,636 51
Transformerless Power Supply 470,472 117 *
Voltage Inverter 349,293 51 *
Voltage Inverter II 210,072 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 592,592 182
3 Watt FM Transmitter Rae XL Tkacik 344,849 83 *
50 Watt Amplifier 516,374 74
8 Note Tune Player 146,427 12 *
8 Watt Audio Amp 382,063 67 *
Aircraft Radio Communications Receiver 287,407 50 *
Crystal Radio 166,094 53 *
Digital Volume Control 346,354 47 *
Electronic Stethoscope 329,340 142 *
FET Audio Mixer 350,969 41
FM Transmitter 1,022,637 420
Guitar Fuzz Effect 255,222 54 *
Microphone Mixer Anatoly I. Shikhatov 257,366 26 *
Mono To Stereo Synthesizer oRbEq 140,942 18 *
One Tube Regenerative Radio NEW! 155,066 4 *
Op Amp Radio 398,502 80 *
Single Chip AM Radio NEW! 105,994 4 *
Single Chip FM Radio NEW! 180,107 1 *
Sound Level Meter 349,119 51 *
Stereo Tube Amplifier Weslee Kinsler 275,250 15 *
Tone Control 317,041 31
Transistor Organ 206,998 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 168,937 27 *
FM Telephone Bug 240,513 57
Phone Busy Indicator 219,607 24 *
Remote Telephone Ringer 123,408 3 *
Ringing Phone Light Flasher 225,637 35 *
Simple Phone Tap Derek Tombrello 389,576 98 *
Telephone Hold Button 134,539 10
Telephone Recorder 222,355 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.