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Security and Alarm Electronic Circuits - Be Secure!

Smoke Detector Circuit - Fire Alarm
An interesting electronic smoke detector circuit that can be used as a fire alarm.
Motorcycle Alarm / Anti-Theft Alarms - Built It Yourself!
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Keep your motorcycle safe with this easy to build and cheap electronic anti-theft motorcycle alarm
Alarm Keypad - Digital Lock Security Device
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Lock and open stuff with a keypad code instead of a conventional lock. Be cool - build a keypad lock!