Per request the circuit today we have relay circuit. It is worth noting
again that the diagram provides a time delay of about 0.5 seconds for
every microfarad in the value of capacitor C1. This permits delays of up
to several minutes. If desired, the delay periods can be made variable
by replacing resistor R2 with a fixed and variable resistor in series
whose nominal values are approximately equal of the total value of R2
(680K).
Automatic Turn Off Relay Circuit Diagram
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