The Time Delay Circuit


Posted on Feb 6, 2014

The length of time the circuit stays on for depends on how long it takes for the stored electrical current to leak back into the circuit, keeping the transistor (and thus the entire circuit) energized. We have a resistor that is limiting the rate at which the capacitor can discharge. If we increase the value of that resistor, it will take the capa


The Time Delay Circuit
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citor longer to discharge and so the cold starting circuit will stay energized for longer. Likewise, if we decrease the value of the resistor, the capacitor will discharge more quickly, and the circuit will operate for a shorter period of time.




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