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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 schematics: Security (Found: 112)

Security:

91.	Small Radio Transmitter Source: http://netartemator.narod.ru/
92.	Smart lock (12C508A). The base sends a data sequency (the password) which is recognized by the key. The key checks the sequency and -if it recognises it -sends to the base another data sequency, as an answer to the password. At the time when the base gets a correct answer (which means that the key has been introduced), the relay is put into action, and it can command a number of consummers. Source: Fumil's digital stuff
93.	Stun Gun Source: Power Amplifiers
94.	Stun gun (1) Source: Amateur-Circuitry
95.	Stun gun (2) Source: Amateur-Circuitry
96.	Stun gun (3) Source: Amateur-Circuitry
97.	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) Source: Bubblegate
98.	The Surfer’s Preserver. It is a simple device that prevents other phones in the house from disrupting your critical Internet session by disconnecting them from the line while you surf! It is also useful in preventing eavesdropping from other extensions. Source: Wenzel Associates
99.	Tiny 2-zone alarm Source: Tomaz's Circuit Collection
100.	Touch activated alarm system Source: http://www.uoguelph.ca/

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