Long pulse timer circuit

Published:2011/4/2 3:17:00 Author:Nicole | Keyword: timer | From:SeekIC

This timer circuit can provide 20min counting time delay. It is a normal decline oscillator with FET current source. Resistance R1 provides reverse migration to the door of JFET transform into power supply. It colses JFET and delays the charging time of C1. C1 is a low drain capacitance similar to polyester resin.



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