in the circuit by experimenting the values of capacitors and resistors. A relay switch is connected at the output of the circuit from which any AC or DC appliance / device can be controlled. The time delay can be further increase by adding more transistors with 470uF capacitor and 47K resistors. Operating voltage of the circuit is 5V to 12V DC, the relay value should be used according to the operating voltage.
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This is an enhanced version of a simple timer circuit mentioned before on this website. In this circuit I have added another two part of simple timer, which will increase the time delay thrice. Any general purpose transistors can be used in the place of Q1, Q2 & Q3. Further enhancement can be done
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Simple Three Transistor Timer Circuit Diagram