expandable scr based burglar alarm


Posted on Feb 5, 2014

This is a simple SCR based burglar alarm circuit. Its features include automatic Exit and Entry delays - together with a timed Bell Cut-off and Reset. The basic alarm has a single zone. This will be adequate in many situations. However - the modular design means that you can add as many zones as you like to the system. Details of a Four-Zone expansion module are provided..


expandable scr based burglar alarm
Click here to download the full size of the above Circuit.




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