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Welcome to CircuitLib.com, the Electronic Circuits Library. Let’s share our Knowledge with hobbyists, individuals, groups and students as widely as possible! Navigate to our pages and discover many novel electronic circuits. The electronic library is regularly refreshed with new circuit schematics, complete electronic projects, tutorials and links for junior and senior courses in electronics engineering. We emphasize on constantly working to produce innovation and present new knowledge, ideas, and vision.

Digital Weekly Programmer

A Digital Weekly Programmer is able to start and/or shutdown automatically any electrical or electronic devices via relays. The machine runs according to a programmable weekly schedule. It supports up to 99 independent actions running on a weekly basis. Each action takes place at an exact time on a specific day of the week, according to a programmable weekly schedule.
 
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1.5 GHz Frequency Counter

1.5 GHz Frequency Meter
How about making your own professional Frequency Counter for your workbench? It's simple! Download the blueprints, build and enjoy. The device measures signal frequencies from 0.1 Hz to 1.5 GHz and displays them on a 2 × 16 character LCD. Supports minimum and maximum hold functions, and selection of frequency units.

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0-999 sec Timer

Countdown Timer

The specific count down timer was initially designed for a UV-Exposure Unit. However, it proved to be extremely useful for providing controlled "on" times for other equipment such as photo-enlargers, developers, small heaters, incandescent lamps, fluorescent lamps, etc. 

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Audio Spectrum Analyzer

LED bar-graph Spectrum Analyzer

This is a real time LED Audio Spectrum Analyzer. You can embed this unit in an audio system or use it as a stand-alone unit. The LED Spectrum Analyzer can display a real-time bar-graph spectrogram...

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5V Mini Power Supply

Mini Power Supply 5V

This is a 5V mini power supply unit. It is capable of driving an 1A load at excellent line and load regulation. The circuit is based on the LM2575N-5 step-down switching regulator.

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