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
Wednesday, November 26, 2025		 Voltage Inverter17
Time Delay Relay14
Yesterday
Tuesday, November 25, 2025		 12VDC To 120VAC Inverter52
FM Transmitter41
Of All Time 12VDC To 120VAC Inverter1,556,551
FM Transmitter1,028,789

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,899 61 *
Car Alarm Arming Horn Beep Canceller bob 143,688 6 *
Wireless Auto Tachometer 352,023 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,865 29 *
Parallel (Printer) Port Interface 297,620 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,967 63 *
3 Channel Spectrum Analyzer 232,009 20
40W Fluorescent Lamp Inverter Bart Milnes 338,537 60 *
Adjustable Strobe Light 319,314 36
Black Light 293,661 29
Colour (Sound) Organ 301,101 36
Electronic Dice NEW! 197,953 10 *
Fantastic Atom Expander 210,473 25
Flash Slave Trigger 230,307 18 *
Infa-Red Remote Control 648,853 216 *
IR Remote Extender NEW! 141,394 3 *
IR Remote Jammer Carl 276,186 110 *
IR Remote Switch NEW! 165,788 9 *
LASER Transmitter/Receiver 428,228 92
LED Chaser 457,553 83 *
LED Metronome NEW! 107,589 3 *
LED Thermometer 214,693 22 *
Light/Dark Detector 314,094 90 *
Simple Colour Organ 145,074 11 *
Strobe Light 283,956 27 *
TRIAC Light Dimmer 564,176 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,262 122 *
Electromagnetic Levitator NEW! 152,359 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 936,191 214 *
AC Motor Speed Controller 404,935 29 *
Air Flow Detector 260,161 54 *
Digital Keypad Combination Lock 210,023 20
Low Voltage Alarm 237,986 58 *
Pine Racecar Victory Judge 109,942 1 *
Pulse Width Modulation DC Motor Control 666,458 94
Rain Detector 313,897 112 *
Simple Lie Detector 575,883 323
Simple Polarity Tester Dudley LeRoux 173,958 13 *
Simple Servo Controller 230,736 22 *
Simple Touch Switch NEW! 178,813 6 *
Simple Two Speed Contactor DC Motor Controller 214,231 21 *
Stepper Motor Controller 764,711 120 *
Time Delay Relay 566,130 88
Time Delay Relay II jawaharlal@excite.com 256,496 39 *
Touch Switch 299,127 51 *
Video Activated Relay 129,559 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,921 10 *
Water Detector With Sump/Bilge Pump Controller 161,208 18 *
Wire Loop Alarm Alex Meaden 213,713 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,824 25 *
12VDC To 120VAC Inverter 1,556,551 691
6V to 12V Converter 539,953 121
Automatic 12V Lead Acid Battery Charger 949,990 248
Automatic Load Sensing Power Switch 176,266 16 *
Car Battery Charger 895,221 159 *
Dual Polarity Power Supply 382,013 84 *
Fixed Voltage Power Supply 320,878 52 *
High Current Power Supply 352,001 66 *
High Voltage High Current Power Supply 273,598 35 *
LASER Power Supply 306,388 28
Portable CD Player Adapter For Car 220,862 12 *
Power Supply 750,669 259 *
Solid State Tesla Coil NEW! 157,162 4
Solid State Tesla Coil/High Voltage Generator 457,668 51
Transformerless Power Supply 473,686 117 *
Voltage Inverter 353,825 51 *
Voltage Inverter II 212,826 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,678 182
3 Watt FM Transmitter Rae XL Tkacik 349,260 83 *
50 Watt Amplifier 520,074 74
8 Note Tune Player 148,814 12 *
8 Watt Audio Amp 386,217 67 *
Aircraft Radio Communications Receiver 290,914 50 *
Crystal Radio 169,832 53 *
Digital Volume Control 349,637 47 *
Electronic Stethoscope 332,698 142 *
FET Audio Mixer 353,839 41
FM Transmitter 1,028,789 420
Guitar Fuzz Effect 258,867 54 *
Microphone Mixer Anatoly I. Shikhatov 260,279 26 *
Mono To Stereo Synthesizer oRbEq 143,911 18 *
One Tube Regenerative Radio NEW! 160,160 4 *
Op Amp Radio 402,157 80 *
Single Chip AM Radio NEW! 108,581 4 *
Single Chip FM Radio NEW! 183,579 1 *
Sound Level Meter 352,180 51 *
Stereo Tube Amplifier Weslee Kinsler 278,658 15 *
Tone Control 320,379 31
Transistor Organ 209,925 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,227 27 *
FM Telephone Bug 242,659 57
Phone Busy Indicator 221,951 24 *
Remote Telephone Ringer 125,506 3 *
Ringing Phone Light Flasher 228,860 35 *
Simple Phone Tap Derek Tombrello 391,998 98 *
Telephone Hold Button 136,704 10
Telephone Recorder 224,592 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.