SIMPLE_BURGLAR_ALARM

Published:2009/7/9 21:39:00 Author:May | From:SeekIC

A simple circuit using either NO or NC sensors uses an RC delay circuit (R2/C2 or R1/C2) to drive emitter-follower Q1, switching SCR1 and buzzer (or bell) BZ1. S1 is used for activation and reset.



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