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
Thursday, October 08, 2026		 12VDC To 120VAC Inverter50
Solid State Tesla Coil/High Voltage Generator45
Yesterday
Wednesday, October 07, 2026		 3 Channel Spectrum Analyzer78
3 Watt FM Transmitter61
Of All Time 12VDC To 120VAC Inverter1,570,047
FM Transmitter1,039,066

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 239,104 61 *
Car Alarm Arming Horn Beep Canceller bob 147,588 6 *
Wireless Auto Tachometer 356,891 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,710 29 *
Parallel (Printer) Port Interface 303,659 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 463,649 63 *
3 Channel Spectrum Analyzer 237,380 20
40W Fluorescent Lamp Inverter Bart Milnes 343,161 60 *
Adjustable Strobe Light 324,560 36
Black Light 299,832 29
Colour (Sound) Organ 306,938 36
Electronic Dice NEW! 202,890 10 *
Fantastic Atom Expander 214,766 25
Flash Slave Trigger 235,628 18 *
Infa-Red Remote Control 655,125 216 *
IR Remote Extender NEW! 146,280 3 *
IR Remote Jammer Carl 281,604 110 *
IR Remote Switch NEW! 170,400 9 *
LASER Transmitter/Receiver 433,735 92
LED Chaser 463,919 83 *
LED Metronome NEW! 112,293 3 *
LED Thermometer 218,839 22 *
Light/Dark Detector 318,457 90 *
Simple Colour Organ 149,374 11 *
Strobe Light 288,522 27 *
TRIAC Light Dimmer 570,805 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 376,545 122 *
Electromagnetic Levitator NEW! 156,654 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 944,155 214 *
AC Motor Speed Controller 411,100 29 *
Air Flow Detector 264,987 54 *
Digital Keypad Combination Lock 214,385 20
Low Voltage Alarm 242,821 58 *
Pine Racecar Victory Judge 114,044 1 *
Pulse Width Modulation DC Motor Control 672,389 94
Rain Detector 318,861 112 *
Simple Lie Detector 581,246 323
Simple Polarity Tester Dudley LeRoux 178,758 13 *
Simple Servo Controller 235,771 22 *
Simple Touch Switch NEW! 183,815 6 *
Simple Two Speed Contactor DC Motor Controller 219,192 21 *
Stepper Motor Controller 772,501 120 *
Time Delay Relay 571,812 88
Time Delay Relay II jawaharlal@excite.com 261,227 39 *
Touch Switch 304,154 51 *
Video Activated Relay 133,806 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 197,389 10 *
Water Detector With Sump/Bilge Pump Controller 165,863 18 *
Wire Loop Alarm Alex Meaden 218,162 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 338,676 25 *
12VDC To 120VAC Inverter 1,570,047 691
6V to 12V Converter 546,474 121
Automatic 12V Lead Acid Battery Charger 957,439 248
Automatic Load Sensing Power Switch 181,090 16 *
Car Battery Charger 901,157 159 *
Dual Polarity Power Supply 387,668 84 *
Fixed Voltage Power Supply 325,128 52 *
High Current Power Supply 357,642 66 *
High Voltage High Current Power Supply 278,340 35 *
LASER Power Supply 311,377 28
Portable CD Player Adapter For Car 225,598 12 *
Power Supply 756,615 259 *
Solid State Tesla Coil NEW! 163,205 4
Solid State Tesla Coil/High Voltage Generator 465,232 51
Transformerless Power Supply 478,565 117 *
Voltage Inverter 360,299 51 *
Voltage Inverter II 217,581 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,500 182
3 Watt FM Transmitter Rae XL Tkacik 355,668 83 *
50 Watt Amplifier 525,435 74
8 Note Tune Player 152,968 12 *
8 Watt Audio Amp 392,577 67 *
Aircraft Radio Communications Receiver 296,736 50 *
Crystal Radio 175,806 53 *
Digital Volume Control 354,858 47 *
Electronic Stethoscope 338,596 142 *
FET Audio Mixer 358,680 41
FM Transmitter 1,039,066 420
Guitar Fuzz Effect 264,713 54 *
Microphone Mixer Anatoly I. Shikhatov 264,996 26 *
Mono To Stereo Synthesizer oRbEq 148,874 18 *
One Tube Regenerative Radio NEW! 167,260 4 *
Op Amp Radio 407,994 80 *
Single Chip AM Radio NEW! 113,373 4 *
Single Chip FM Radio NEW! 189,490 1 *
Sound Level Meter 357,284 51 *
Stereo Tube Amplifier Weslee Kinsler 283,838 15 *
Tone Control 325,711 31
Transistor Organ 215,308 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 175,196 27 *
FM Telephone Bug 246,787 57
Phone Busy Indicator 226,439 24 *
Remote Telephone Ringer 129,639 3 *
Ringing Phone Light Flasher 234,486 35 *
Simple Phone Tap Derek Tombrello 396,341 98 *
Telephone Hold Button 140,567 10
Telephone Recorder 228,858 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.