0.1 To 90 second timer

Posted on Jul 11, 2012

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

0.1 To 90 second timer
Click here to download the full size of the above Circuit.

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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