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, August 21, 2025		 3 Watt FM Transmitter22
Stepper Motor Controller20
Yesterday
Wednesday, August 20, 2025		 Stepper Motor Controller48
3 Watt FM Transmitter39
Of All Time 12VDC To 120VAC Inverter1,551,834
FM Transmitter1,024,722

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,174 61 *
Car Alarm Arming Horn Beep Canceller bob 142,074 6 *
Wireless Auto Tachometer 350,020 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,423 29 *
Parallel (Printer) Port Interface 295,015 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,646 63 *
3 Channel Spectrum Analyzer 229,886 20
40W Fluorescent Lamp Inverter Bart Milnes 336,655 60 *
Adjustable Strobe Light 317,197 36
Black Light 291,117 29
Colour (Sound) Organ 298,792 36
Electronic Dice NEW! 195,919 10 *
Fantastic Atom Expander 208,728 25
Flash Slave Trigger 228,342 18 *
Infa-Red Remote Control 646,348 216 *
IR Remote Extender NEW! 139,491 3 *
IR Remote Jammer Carl 274,103 110 *
IR Remote Switch NEW! 163,912 9 *
LASER Transmitter/Receiver 425,983 92
LED Chaser 454,970 83 *
LED Metronome NEW! 105,757 3 *
LED Thermometer 213,012 22 *
Light/Dark Detector 312,254 90 *
Simple Colour Organ 143,299 11 *
Strobe Light 282,128 27 *
TRIAC Light Dimmer 561,871 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,959 122 *
Electromagnetic Levitator NEW! 150,652 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 933,132 214 *
AC Motor Speed Controller 402,043 29 *
Air Flow Detector 258,405 54 *
Digital Keypad Combination Lock 208,211 20
Low Voltage Alarm 235,994 58 *
Pine Racecar Victory Judge 108,294 1 *
Pulse Width Modulation DC Motor Control 664,026 94
Rain Detector 311,899 112 *
Simple Lie Detector 573,433 323
Simple Polarity Tester Dudley LeRoux 171,849 13 *
Simple Servo Controller 228,747 22 *
Simple Touch Switch NEW! 176,817 6 *
Simple Two Speed Contactor DC Motor Controller 212,236 21 *
Stepper Motor Controller 761,192 120 *
Time Delay Relay 564,023 88
Time Delay Relay II jawaharlal@excite.com 254,408 39 *
Touch Switch 297,191 51 *
Video Activated Relay 127,820 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,624 10 *
Water Detector With Sump/Bilge Pump Controller 159,353 18 *
Wire Loop Alarm Alex Meaden 212,016 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 327,137 25 *
12VDC To 120VAC Inverter 1,551,834 691
6V to 12V Converter 537,486 121
Automatic 12V Lead Acid Battery Charger 947,442 248
Automatic Load Sensing Power Switch 174,348 16 *
Car Battery Charger 892,719 159 *
Dual Polarity Power Supply 379,531 84 *
Fixed Voltage Power Supply 318,981 52 *
High Current Power Supply 349,274 66 *
High Voltage High Current Power Supply 271,620 35 *
LASER Power Supply 304,422 28
Portable CD Player Adapter For Car 218,985 12 *
Power Supply 748,401 259 *
Solid State Tesla Coil NEW! 154,835 4
Solid State Tesla Coil/High Voltage Generator 455,002 51
Transformerless Power Supply 471,495 117 *
Voltage Inverter 350,882 51 *
Voltage Inverter II 210,917 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,675 182
3 Watt FM Transmitter Rae XL Tkacik 346,579 83 *
50 Watt Amplifier 517,725 74
8 Note Tune Player 147,134 12 *
8 Watt Audio Amp 383,442 67 *
Aircraft Radio Communications Receiver 288,536 50 *
Crystal Radio 167,208 53 *
Digital Volume Control 347,439 47 *
Electronic Stethoscope 330,370 142 *
FET Audio Mixer 351,868 41
FM Transmitter 1,024,722 420
Guitar Fuzz Effect 256,277 54 *
Microphone Mixer Anatoly I. Shikhatov 258,266 26 *
Mono To Stereo Synthesizer oRbEq 141,845 18 *
One Tube Regenerative Radio NEW! 156,842 4 *
Op Amp Radio 399,764 80 *
Single Chip AM Radio NEW! 106,773 4 *
Single Chip FM Radio NEW! 181,207 1 *
Sound Level Meter 350,047 51 *
Stereo Tube Amplifier Weslee Kinsler 276,194 15 *
Tone Control 318,120 31
Transistor Organ 207,918 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,622 27 *
FM Telephone Bug 241,155 57
Phone Busy Indicator 220,355 24 *
Remote Telephone Ringer 124,090 3 *
Ringing Phone Light Flasher 226,708 35 *
Simple Phone Tap Derek Tombrello 390,356 98 *
Telephone Hold Button 135,295 10
Telephone Recorder 223,035 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.