Simple Timer

139

01:53:55

Longer than usual timer.  Controlled input is top right and when relay closes is sent out bottom right.  Vary battery voltage and adjustable resistor to set length of time for your output load.  Calibrate with stopwatch and mark resistor knob and paper dial of the time settings.
To start:  flip SPDT switch to right of battery down to charge capacitor about 4 or 5 seconds when this is flipped up the relay closes and time "on" starts.

published 11 years ago

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