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If the switch is closed, the capacitor begins to charge through the potentiometer 100kohms.Quan capacitor reaches a certain voltage between the terminals comes running to the base of the transistor which saturates; then the relay is activated and the engine starts up. We delayed encessa engine, if at any time the button is activated P will cause a short circuit to the terminals of the capacitor. Then, the capacitor is discharged at once, cutting the transistor passes, the relay is deactivated and the motor stops. left To enlarge the delay, the circuit is improved by introducing left another transistor left circuit as shown below.
In this circuit the transistor has saturated T1 and T2 cutoff is. So the engine is stopped. When you press P, the transistor T1 going to press, left the engine keeps running the duration of the timing. Furthermore month delay resistance. Circuit, the relay is activated left when pressing P.
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