Power Off Time Delay Relay Circuit

The capacitor resistor values can be worked out from the relay coil current and transistor gain. Delay timer with relay i am looking to build a circuit that would control an output relay. The aim of this project is to demonstrate the functioning of a time delay relay.

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Power off time delay relay circuit.

The time delay for the common emitter will be approximately 3 time constants or 3 r c. The working is very simple and is explained below. Very handy and simple circuit if your looking to have lights accessories or other devices power off after a preset time has elapsed after power is no longe. The circuit is based on the rc time delay and zener controlled switch.

Time delay relay can provide a short delay after power is turned on and before switching on the device. For example a 120 ohm relay coil will draw 100 ma at 12 volts and assumming a transistor gain of 30 the base current will be 100 30 3 ma. The following circuit was requested by fastshack3. This would be done in 12v and the sequence will be initiated by a manual switch.

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