The LED also stays switched ON until the capacitor gets fully discharged.
On releasing the push button, though the power to the base gets disconnected, the transistor continues to conduct with the aid of the stored energy in the capacitor which now starts discharging its stored charge via the transistor. However in the course of the above action, the capacitor also gets charged fully. On depressing the button momentarily, a positive voltage from the supply line enters the base resistor and switches ON the transistor and subsequently the LED. The transistor has been provided with the usual base resistor for the current limiting functions.Ī LED which is used here just indication purposes behaves like the collector load of the circuit.Ī capacitor, which is the crucial part of the circuit gets the specific position in the circuit, we can see that it's been placed at the other end of the base resistor and not directly to the base of the transistor.Ī push button is used to initiate the circuit. The first circuit diagram shows how a transistors and a few other passive components may be connected for acquiring the intended delay timing outputs. Using a Single Transistor and Push Button You may also want to read about IC 555 based delay timers. Let's analyze the various configurations in details.
Without the specified delay the circuit could malfunction or even get damaged. In many electronic circuit applications a delay of a few seconds or minutes becomes a crucial requirement for ensuring correct operation of the circuit.
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