Long Period SCR Timer

Posted on Feb 7, 2014

This is a SCR timer circuit. Here, SCR is used to drive the final actuator, the buzzer. The time constanst of this circuit is determined by R1 and C1. The buzzer will sound when C1 charges up to a desired level, it will cause the Q1 to conduct and triggers SCR1. The use of FET for Q1 make the RC constant can be very high for very long time dela

Long Period SCR Timer
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y, make this circuit has very wide range time setting. Here is the schematic diagram of the circuit:

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