An Expandable Transistor Based Burglar Alarm circuit


Posted on Feb 6, 2014

This transistor based alarm features automatic Exit and Entry delays - together with a timed Bell Cut-off and system Reset. Along with the Exit/Entry zone - the basic alarm board has one Instant Zone. This will be adequate in many situations. However - the modular design means that it`s easy to add as many zones as you like to the system. Details of a Four-Zone expansion module are provided..


An Expandable Transistor Based Burglar Alarm circuit
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