This is a very simple design of circuit in which the LED becomes ON only after a preset time the power supply is switched ON. This circuit is consist of low price component. This is the figure of the circuit.
Principle work of the circuit is when the power supply is switched on the transistor will be OFF. The capacitor now charges via the preset R3 and when the voltage across C1 is sufficient, the transistor switches ON and LED glows. The ON delay depends on the value of POT R3 .You can increase the time delay by increasing the resistance of POT R3. The circuit can be powered from a 10V DC power supply. Anyway you can use from 6 to 18V for powering this cicuit, but you need to adjust the POT R3 for getting the required delay.
This circuit alone may not have much practical applications but this can be used in many other projects where a delayed ON indication is required.
Principle work of the circuit is when the power supply is switched on the transistor will be OFF. The capacitor now charges via the preset R3 and when the voltage across C1 is sufficient, the transistor switches ON and LED glows. The ON delay depends on the value of POT R3 .You can increase the time delay by increasing the resistance of POT R3. The circuit can be powered from a 10V DC power supply. Anyway you can use from 6 to 18V for powering this cicuit, but you need to adjust the POT R3 for getting the required delay.
This circuit alone may not have much practical applications but this can be used in many other projects where a delayed ON indication is required.
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