Power Off Time Delay Relay Circuit

This would be done in 12v and the sequence will be initiated by a manual switch. The working is very simple and is explained below. The capacitor resistor values can be worked out from the relay coil current and transistor gain.

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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.

Power off time delay relay circuit.

Time delay relay can provide a short delay after power is turned on and before switching on the device. The following circuit was requested by fastshack3. The time delay for the common emitter will be approximately 3 time constants or 3 r c. The circuit is based on the rc time delay and zener controlled switch.

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. 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. Timer relay drok time delay relay dc 5v 12v 24v delay controller board delay off cycle timer 0 01s 9999mins trigger delay switching relay module with lcd display support micro usb 5v power supply 4 6 out of 5 stars 132.

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