01_TO_90_SECOND_TIMER

Published:2009/6/29 2:25:00 Author:May | From:SeekIC

The timer interval starts when power is applied to circuit and terminates when voltage is applied to load. 2N2646 is used in oscillator which pulses base 2 of D5K. This reduces the effective L of D5K and allows a much larger timing resistor and smaller timing capacitor to be used than would otherwise be possible.



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