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10 Jun 2008
This circuit features automatic Exit and Entry delays – timed Bell/Siren cut-off – and system reset. It has provision for normally-open and normally-closed switches – and will suit all of the usual input devices (Pressure Mats, Magnetic Reed Contacts, Foil Tape, PIRs and Inertia Sensors). [via]
A Transistor Based – Single Zone Alarm - [Link]
Tags: Alarm, Foil Tape, Inertia Sensor, Magnetic Reed Contacts, PIR, Pressure Mats, Single Zone, Transistor
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