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, June 26, 2025		 3 Watt FM Transmitter25
Car Battery Charger24
Yesterday
Wednesday, June 25, 2025		 12VDC To 120VAC Inverter65
Dual Polarity Power Supply41
Of All Time 12VDC To 120VAC Inverter1,549,426
FM Transmitter1,022,881

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,448 61 *
Car Alarm Arming Horn Beep Canceller bob 141,513 6 *
Wireless Auto Tachometer 349,262 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 164,851 29 *
Parallel (Printer) Port Interface 294,058 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 454,887 63 *
3 Channel Spectrum Analyzer 229,067 20
40W Fluorescent Lamp Inverter Bart Milnes 335,938 60 *
Adjustable Strobe Light 316,301 36
Black Light 290,193 29
Colour (Sound) Organ 297,824 36
Electronic Dice NEW! 195,178 10 *
Fantastic Atom Expander 208,188 25
Flash Slave Trigger 227,577 18 *
Infa-Red Remote Control 645,137 216 *
IR Remote Extender NEW! 138,799 3 *
IR Remote Jammer Carl 273,261 110 *
IR Remote Switch NEW! 163,176 9 *
LASER Transmitter/Receiver 425,024 92
LED Chaser 454,017 83 *
LED Metronome NEW! 105,075 3 *
LED Thermometer 212,369 22 *
Light/Dark Detector 311,611 90 *
Simple Colour Organ 142,667 11 *
Strobe Light 281,531 27 *
TRIAC Light Dimmer 561,043 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,175 122 *
Electromagnetic Levitator NEW! 149,989 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,063 214 *
AC Motor Speed Controller 400,813 29 *
Air Flow Detector 257,665 54 *
Digital Keypad Combination Lock 207,521 20
Low Voltage Alarm 235,194 58 *
Pine Racecar Victory Judge 107,734 1 *
Pulse Width Modulation DC Motor Control 662,881 94
Rain Detector 311,223 112 *
Simple Lie Detector 572,403 323
Simple Polarity Tester Dudley LeRoux 171,157 13 *
Simple Servo Controller 227,919 22 *
Simple Touch Switch NEW! 176,005 6 *
Simple Two Speed Contactor DC Motor Controller 211,433 21 *
Stepper Motor Controller 759,617 120 *
Time Delay Relay 563,108 88
Time Delay Relay II jawaharlal@excite.com 253,665 39 *
Touch Switch 296,292 51 *
Video Activated Relay 127,173 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 187,808 10 *
Water Detector With Sump/Bilge Pump Controller 158,691 18 *
Wire Loop Alarm Alex Meaden 211,308 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 325,865 25 *
12VDC To 120VAC Inverter 1,549,426 691
6V to 12V Converter 536,407 121
Automatic 12V Lead Acid Battery Charger 946,362 248
Automatic Load Sensing Power Switch 173,574 16 *
Car Battery Charger 891,606 159 *
Dual Polarity Power Supply 378,550 84 *
Fixed Voltage Power Supply 318,171 52 *
High Current Power Supply 348,220 66 *
High Voltage High Current Power Supply 270,768 35 *
LASER Power Supply 303,565 28
Portable CD Player Adapter For Car 218,266 12 *
Power Supply 747,524 259 *
Solid State Tesla Coil NEW! 153,797 4
Solid State Tesla Coil/High Voltage Generator 453,780 51
Transformerless Power Supply 470,609 117 *
Voltage Inverter 349,429 51 *
Voltage Inverter II 210,171 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 592,743 182
3 Watt FM Transmitter Rae XL Tkacik 345,039 83 *
50 Watt Amplifier 516,547 74
8 Note Tune Player 146,548 12 *
8 Watt Audio Amp 382,243 67 *
Aircraft Radio Communications Receiver 287,565 50 *
Crystal Radio 166,247 53 *
Digital Volume Control 346,514 47 *
Electronic Stethoscope 329,451 142 *
FET Audio Mixer 351,123 41
FM Transmitter 1,022,881 420
Guitar Fuzz Effect 255,351 54 *
Microphone Mixer Anatoly I. Shikhatov 257,504 26 *
Mono To Stereo Synthesizer oRbEq 141,060 18 *
One Tube Regenerative Radio NEW! 155,262 4 *
Op Amp Radio 398,633 80 *
Single Chip AM Radio NEW! 106,119 4 *
Single Chip FM Radio NEW! 180,251 1 *
Sound Level Meter 349,258 51 *
Stereo Tube Amplifier Weslee Kinsler 275,347 15 *
Tone Control 317,199 31
Transistor Organ 207,144 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 168,990 27 *
FM Telephone Bug 240,557 57
Phone Busy Indicator 219,686 24 *
Remote Telephone Ringer 123,457 3 *
Ringing Phone Light Flasher 225,738 35 *
Simple Phone Tap Derek Tombrello 389,641 98 *
Telephone Hold Button 134,617 10
Telephone Recorder 222,413 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.