The below Simple Timer with Transistor Circuit Diagram is a simple timer that uses only two Darlington transistors and a capacitor base to generate a delay. When SW1 is pressed, the timer starts, the time setting is set by VR1. The duration of the timer is given by the values of the potentiometer VR1 and the capacitor C1 that this circuit is 220 pF. To reach other durations of time must change the values of these two components.
Timer with Transistor Circuit Diagram
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