Event Failure Alarm

555 circuit event failure alarm
when power is applied, C1 starts to charge through R2. unless S1 is closed before   the timing cycle is completed, the buzzer will sound.

use any switch for S1 and it can be mounted externally from the circuit.

Keywords : 555 Circuit, Failure, Alarm, 555timer
Writer : delon  |
19 Oct 2006 Thr   
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