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 Inverter12
Time Delay Relay12
Yesterday
Tuesday, November 25, 2025		 12VDC To 120VAC Inverter52
FM Transmitter41
Of All Time 12VDC To 120VAC Inverter1,556,544
FM Transmitter1,028,785

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,897 61 *
Car Alarm Arming Horn Beep Canceller bob 143,686 6 *
Wireless Auto Tachometer 352,021 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,864 29 *
Parallel (Printer) Port Interface 297,617 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,964 63 *
3 Channel Spectrum Analyzer 232,008 20
40W Fluorescent Lamp Inverter Bart Milnes 338,535 60 *
Adjustable Strobe Light 319,313 36
Black Light 293,657 29
Colour (Sound) Organ 301,100 36
Electronic Dice NEW! 197,950 10 *
Fantastic Atom Expander 210,471 25
Flash Slave Trigger 230,304 18 *
Infa-Red Remote Control 648,850 216 *
IR Remote Extender NEW! 141,392 3 *
IR Remote Jammer Carl 276,184 110 *
IR Remote Switch NEW! 165,787 9 *
LASER Transmitter/Receiver 428,226 92
LED Chaser 457,551 83 *
LED Metronome NEW! 107,586 3 *
LED Thermometer 214,691 22 *
Light/Dark Detector 314,091 90 *
Simple Colour Organ 145,071 11 *
Strobe Light 283,953 27 *
TRIAC Light Dimmer 564,174 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,258 122 *
Electromagnetic Levitator NEW! 152,357 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 936,188 214 *
AC Motor Speed Controller 404,933 29 *
Air Flow Detector 260,155 54 *
Digital Keypad Combination Lock 210,022 20
Low Voltage Alarm 237,984 58 *
Pine Racecar Victory Judge 109,940 1 *
Pulse Width Modulation DC Motor Control 666,454 94
Rain Detector 313,893 112 *
Simple Lie Detector 575,879 323
Simple Polarity Tester Dudley LeRoux 173,954 13 *
Simple Servo Controller 230,734 22 *
Simple Touch Switch NEW! 178,812 6 *
Simple Two Speed Contactor DC Motor Controller 214,229 21 *
Stepper Motor Controller 764,710 120 *
Time Delay Relay 566,128 88
Time Delay Relay II jawaharlal@excite.com 256,492 39 *
Touch Switch 299,125 51 *
Video Activated Relay 129,557 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,920 10 *
Water Detector With Sump/Bilge Pump Controller 161,205 18 *
Wire Loop Alarm Alex Meaden 213,709 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,822 25 *
12VDC To 120VAC Inverter 1,556,544 691
6V to 12V Converter 539,950 121
Automatic 12V Lead Acid Battery Charger 949,985 248
Automatic Load Sensing Power Switch 176,264 16 *
Car Battery Charger 895,218 159 *
Dual Polarity Power Supply 382,012 84 *
Fixed Voltage Power Supply 320,875 52 *
High Current Power Supply 351,998 66 *
High Voltage High Current Power Supply 273,595 35 *
LASER Power Supply 306,384 28
Portable CD Player Adapter For Car 220,860 12 *
Power Supply 750,666 259 *
Solid State Tesla Coil NEW! 157,161 4
Solid State Tesla Coil/High Voltage Generator 457,663 51
Transformerless Power Supply 473,682 117 *
Voltage Inverter 353,820 51 *
Voltage Inverter II 212,824 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,676 182
3 Watt FM Transmitter Rae XL Tkacik 349,259 83 *
50 Watt Amplifier 520,071 74
8 Note Tune Player 148,813 12 *
8 Watt Audio Amp 386,211 67 *
Aircraft Radio Communications Receiver 290,913 50 *
Crystal Radio 169,829 53 *
Digital Volume Control 349,634 47 *
Electronic Stethoscope 332,696 142 *
FET Audio Mixer 353,837 41
FM Transmitter 1,028,785 420
Guitar Fuzz Effect 258,864 54 *
Microphone Mixer Anatoly I. Shikhatov 260,275 26 *
Mono To Stereo Synthesizer oRbEq 143,909 18 *
One Tube Regenerative Radio NEW! 160,158 4 *
Op Amp Radio 402,155 80 *
Single Chip AM Radio NEW! 108,579 4 *
Single Chip FM Radio NEW! 183,578 1 *
Sound Level Meter 352,178 51 *
Stereo Tube Amplifier Weslee Kinsler 278,655 15 *
Tone Control 320,377 31
Transistor Organ 209,918 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,226 27 *
FM Telephone Bug 242,657 57
Phone Busy Indicator 221,950 24 *
Remote Telephone Ringer 125,504 3 *
Ringing Phone Light Flasher 228,858 35 *
Simple Phone Tap Derek Tombrello 391,994 98 *
Telephone Hold Button 136,701 10
Telephone Recorder 224,589 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.