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
Monday, August 11, 2025		 12VDC To 120VAC Inverter14
12V To 24V DC-DC Converter11
Yesterday
Sunday, August 10, 2025		 Stepper Motor Controller43
12VDC To 120VAC Inverter35
Of All Time 12VDC To 120VAC Inverter1,551,409
FM Transmitter1,024,397

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,047 61 *
Car Alarm Arming Horn Beep Canceller bob 141,975 6 *
Wireless Auto Tachometer 349,883 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,334 29 *
Parallel (Printer) Port Interface 294,861 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,488 63 *
3 Channel Spectrum Analyzer 229,738 20
40W Fluorescent Lamp Inverter Bart Milnes 336,540 60 *
Adjustable Strobe Light 317,033 36
Black Light 290,937 29
Colour (Sound) Organ 298,565 36
Electronic Dice NEW! 195,773 10 *
Fantastic Atom Expander 208,626 25
Flash Slave Trigger 228,197 18 *
Infa-Red Remote Control 646,157 216 *
IR Remote Extender NEW! 139,372 3 *
IR Remote Jammer Carl 273,928 110 *
IR Remote Switch NEW! 163,762 9 *
LASER Transmitter/Receiver 425,809 92
LED Chaser 454,785 83 *
LED Metronome NEW! 105,633 3 *
LED Thermometer 212,884 22 *
Light/Dark Detector 312,119 90 *
Simple Colour Organ 143,186 11 *
Strobe Light 282,002 27 *
TRIAC Light Dimmer 561,686 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,796 122 *
Electromagnetic Levitator NEW! 150,530 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,906 214 *
AC Motor Speed Controller 401,758 29 *
Air Flow Detector 258,275 54 *
Digital Keypad Combination Lock 208,090 20
Low Voltage Alarm 235,840 58 *
Pine Racecar Victory Judge 108,188 1 *
Pulse Width Modulation DC Motor Control 663,771 94
Rain Detector 311,783 112 *
Simple Lie Detector 573,258 323
Simple Polarity Tester Dudley LeRoux 171,732 13 *
Simple Servo Controller 228,591 22 *
Simple Touch Switch NEW! 176,653 6 *
Simple Two Speed Contactor DC Motor Controller 212,090 21 *
Stepper Motor Controller 760,850 120 *
Time Delay Relay 563,852 88
Time Delay Relay II jawaharlal@excite.com 254,282 39 *
Touch Switch 297,035 51 *
Video Activated Relay 127,690 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,457 10 *
Water Detector With Sump/Bilge Pump Controller 159,246 18 *
Wire Loop Alarm Alex Meaden 211,882 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 326,870 25 *
12VDC To 120VAC Inverter 1,551,409 691
6V to 12V Converter 537,293 121
Automatic 12V Lead Acid Battery Charger 947,244 248
Automatic Load Sensing Power Switch 174,192 16 *
Car Battery Charger 892,544 159 *
Dual Polarity Power Supply 379,366 84 *
Fixed Voltage Power Supply 318,844 52 *
High Current Power Supply 349,085 66 *
High Voltage High Current Power Supply 271,488 35 *
LASER Power Supply 304,266 28
Portable CD Player Adapter For Car 218,850 12 *
Power Supply 748,235 259 *
Solid State Tesla Coil NEW! 154,641 4
Solid State Tesla Coil/High Voltage Generator 454,757 51
Transformerless Power Supply 471,336 117 *
Voltage Inverter 350,632 51 *
Voltage Inverter II 210,791 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,516 182
3 Watt FM Transmitter Rae XL Tkacik 346,318 83 *
50 Watt Amplifier 517,522 74
8 Note Tune Player 147,028 12 *
8 Watt Audio Amp 383,224 67 *
Aircraft Radio Communications Receiver 288,358 50 *
Crystal Radio 167,021 53 *
Digital Volume Control 347,286 47 *
Electronic Stethoscope 330,205 142 *
FET Audio Mixer 351,714 41
FM Transmitter 1,024,397 420
Guitar Fuzz Effect 256,105 54 *
Microphone Mixer Anatoly I. Shikhatov 258,123 26 *
Mono To Stereo Synthesizer oRbEq 141,704 18 *
One Tube Regenerative Radio NEW! 156,531 4 *
Op Amp Radio 399,563 80 *
Single Chip AM Radio NEW! 106,668 4 *
Single Chip FM Radio NEW! 181,070 1 *
Sound Level Meter 349,905 51 *
Stereo Tube Amplifier Weslee Kinsler 276,011 15 *
Tone Control 317,933 31
Transistor Organ 207,781 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,498 27 *
FM Telephone Bug 241,039 57
Phone Busy Indicator 220,236 24 *
Remote Telephone Ringer 123,977 3 *
Ringing Phone Light Flasher 226,464 35 *
Simple Phone Tap Derek Tombrello 390,219 98 *
Telephone Hold Button 135,173 10
Telephone Recorder 222,916 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.