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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)
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21. Deer Repellent (18k) This seismic sensor can detect and frighten away intruders.
[ File in a format pdf ]

Source: Wenzel Associates
22. Digital combination lock

Source: http://www.mitedu.freeserve.co.uk/
23. Digital Combination Lock

Source: Circuit Exchange International
24. Digital entry lock

Source: http://www.designnotes.com/
25. Dongle -serial port (12C508A) This device is NOT a professional dongle. You can use it to protect your software , but you must agree with its major disadvantage: it needs one of the COM ports on your PC. The advantages are the low cost and simplicity.

Source: Fumil's digital stuff
26. Door knob alarm (PDF)
[ File in a format pdf ]

Source: http://www.discovercircuits.com/
27. Doorphone intercom

Source: http://cxem.net.ru/
28. Dummy alarm

Source: CircuitoZ
29. Economy radar detector

Source: ZPS-electronics
30. Electronic "snap"

Source: CircuitoZ

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