CircuitsRadio, a resource for engineers, hobbyists, inventors & consultants, is a collection of 12,000+ electronic circuits
or electronic schematics cross-referenced into 500+ categories to find quick solutions
for electronic design problems. Bad links are removed and new circuits or schematics are added frequently.
This site contains lots of FREE electronic circuits (schematics) & do-it-yourself (DIY) circuit diagrams for hobbyists, students, professionals etc. covering a wide range of categories in electronics like audio, music,home/garden related,computer hardware,radio,robotics etc to name a few. There are also links to sites that offer hobby electronic kits and other electronics hobby related stuff. Use the menu on the left to browse different circuit categories.
OVER 10.000 SCHEMATICS & DIAGRAMS
(Catalogue of Electronic Circuits)
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Electronic schematic: How to Build a 10-Key Serial Keypad. Crea...
How to Build a 10-Key Serial Keypad. Creating & Using Asynchronous Serial Solutions: How to create your own Serial Keypads. This project uses PicBasic Pro, and the PIC16C620A microcontroller to build a 10-key serial keypad. The PIC16C620A only costs $2.50 each in single quantities, and the keys are simple normally-open, push-button switches. Build a user input keypad for your next basic stamp or PIC design and use a single I/O-pin for the interface.
