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.
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.
This would be done in 12v and the sequence will be initiated by a manual switch.
Delay timer with relay i am looking to build a circuit that would control an output relay.
The circuit is based on the rc time delay and zener controlled switch.
The working is very simple and is explained below.
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.
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 time delay for the common emitter will be approximately 3 time constants or 3 r c.