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: Telephone line monitor. If you feel that ...
Telephone line monitor. If you feel that somebody is tampering with your telephone line you might find this little circuit useful. It detects if there is another telephone connected to the line, if there is a short or an open line. (simple)
