PUT_LONG_DURATION_TIMER

Published:2009/7/7 4:08:00 Author:May | From:SeekIC

The time circuit can provide a time delay of up to 20 minutes. The circuit is a standard relaxation oscillator with a FET current source in which resistor R1 is used to provide reverse bias on the gate-to-source of the JFET. This tums the JFET off and increases the charging time of C1. C1 should be a low leakage capacitor such as a mylar type.



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