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.

1.5 GHz Frequency Counter
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.