Multi-Zone Transistor Alarm

Published:2012/11/19 1:34:00 Author:muriel | Keyword: Multi-Zone, Transistor, Alarm | From:SeekIC

This is a simple transistor-based burglar alarm circuit. Its features include automatic Exit and Entry delays - together with a timed Bell cut-off and Reset. It's designed to be used with the usual types of normally-closed input devices such as - magnetic-reed contacts - micro switches - foil tape - and PIRs. The basic alarm has an Exit/Entry zone and an Instant zone. This will be adequate in many situations. However - larger buildings are best divided into a number of smaller zones. The design allows you to Add As Many Zones As You Like to the basic system. They are Instant Zones - and may be triggered by both normally-open and normally-closed input devices.



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