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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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51. FM Transmitter

Source: http://netartemator.narod.ru/
52. FOUR-IN-ONE BURGLAR ALARM
[ File in a format zip ]

Source: Electronics 2000
53. Fridge Alarm (9k) Alerts you when the refrigerator door is left open.
[ File in a format pdf ]

Source: Wenzel Associates
54. Fridge door alarm

Source: http://space.tin.it/
55. Fridge door Alarm. Beeps if you left open the door over 20 seconds. 3V battery operation, simple circuitry

Source: RED Free Circuit Designs
56. Frost Alarm or Cold Activated Switch

Source: Circuit Exchange International
57. Garage Door Opener Scanner

Source: Circuits Archive - Univesity of Washington
58. Gate Alarm

Source: http://www.mitedu.freeserve.co.uk/
59. Gate alarm circuit

Source: http://www.mitedu.freeserve.co.uk/
60. Gate Alarm Circuit

Source: Circuit Exchange International

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