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 29, 2026		 7 Segment LED Counter10
One Tube Regenerative Radio10
Yesterday
Wednesday, October 28, 2026		 7 Segment LED Counter66
One Tube Regenerative Radio47
Of All Time 12VDC To 120VAC Inverter1,570,781
FM Transmitter1,039,624

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 239,380 61 *
Car Alarm Arming Horn Beep Canceller bob 147,817 6 *
Wireless Auto Tachometer 357,201 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,981 29 *
Parallel (Printer) Port Interface 304,024 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 464,020 63 *
3 Channel Spectrum Analyzer 237,763 20
40W Fluorescent Lamp Inverter Bart Milnes 343,478 60 *
Adjustable Strobe Light 324,906 36
Black Light 300,265 29
Colour (Sound) Organ 307,380 36
Electronic Dice NEW! 203,246 10 *
Fantastic Atom Expander 215,102 25
Flash Slave Trigger 236,005 18 *
Infa-Red Remote Control 655,504 216 *
IR Remote Extender NEW! 146,607 3 *
IR Remote Jammer Carl 281,916 110 *
IR Remote Switch NEW! 170,789 9 *
LASER Transmitter/Receiver 434,081 92
LED Chaser 464,290 83 *
LED Metronome NEW! 112,597 3 *
LED Thermometer 219,102 22 *
Light/Dark Detector 318,732 90 *
Simple Colour Organ 149,669 11 *
Strobe Light 288,851 27 *
TRIAC Light Dimmer 571,192 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 376,925 122 *
Electromagnetic Levitator NEW! 156,951 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 944,769 214 *
AC Motor Speed Controller 411,505 29 *
Air Flow Detector 265,264 54 *
Digital Keypad Combination Lock 214,657 20
Low Voltage Alarm 243,135 58 *
Pine Racecar Victory Judge 114,372 1 *
Pulse Width Modulation DC Motor Control 672,820 94
Rain Detector 319,194 112 *
Simple Lie Detector 581,661 323
Simple Polarity Tester Dudley LeRoux 179,105 13 *
Simple Servo Controller 236,086 22 *
Simple Touch Switch NEW! 184,132 6 *
Simple Two Speed Contactor DC Motor Controller 219,570 21 *
Stepper Motor Controller 772,945 120 *
Time Delay Relay 572,167 88
Time Delay Relay II jawaharlal@excite.com 261,508 39 *
Touch Switch 304,504 51 *
Video Activated Relay 134,143 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 197,778 10 *
Water Detector With Sump/Bilge Pump Controller 166,158 18 *
Wire Loop Alarm Alex Meaden 218,496 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 339,098 25 *
12VDC To 120VAC Inverter 1,570,781 691
6V to 12V Converter 546,854 121
Automatic 12V Lead Acid Battery Charger 957,934 248
Automatic Load Sensing Power Switch 181,383 16 *
Car Battery Charger 901,528 159 *
Dual Polarity Power Supply 387,968 84 *
Fixed Voltage Power Supply 325,412 52 *
High Current Power Supply 357,984 66 *
High Voltage High Current Power Supply 278,617 35 *
LASER Power Supply 311,728 28
Portable CD Player Adapter For Car 225,927 12 *
Power Supply 757,025 259 *
Solid State Tesla Coil NEW! 163,582 4
Solid State Tesla Coil/High Voltage Generator 465,635 51
Transformerless Power Supply 478,900 117 *
Voltage Inverter 360,731 51 *
Voltage Inverter II 217,883 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,792 182
3 Watt FM Transmitter Rae XL Tkacik 355,979 83 *
50 Watt Amplifier 525,758 74
8 Note Tune Player 153,258 12 *
8 Watt Audio Amp 392,965 67 *
Aircraft Radio Communications Receiver 297,091 50 *
Crystal Radio 176,122 53 *
Digital Volume Control 355,190 47 *
Electronic Stethoscope 338,986 142 *
FET Audio Mixer 359,040 41
FM Transmitter 1,039,624 420
Guitar Fuzz Effect 265,078 54 *
Microphone Mixer Anatoly I. Shikhatov 265,288 26 *
Mono To Stereo Synthesizer oRbEq 149,237 18 *
One Tube Regenerative Radio NEW! 167,835 4 *
Op Amp Radio 408,436 80 *
Single Chip AM Radio NEW! 113,679 4 *
Single Chip FM Radio NEW! 189,899 1 *
Sound Level Meter 357,657 51 *
Stereo Tube Amplifier Weslee Kinsler 284,159 15 *
Tone Control 326,019 31
Transistor Organ 215,700 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 175,477 27 *
FM Telephone Bug 247,095 57
Phone Busy Indicator 226,767 24 *
Remote Telephone Ringer 129,932 3 *
Ringing Phone Light Flasher 234,798 35 *
Simple Phone Tap Derek Tombrello 396,646 98 *
Telephone Hold Button 140,843 10
Telephone Recorder 229,146 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.