I'm trying to work out a simple circuit which takes a momentary input from a switch, switches a relay on for about 40 seconds, then switches the entire circuit off.
The key is that the circuit is completely off during idle, so it doesn't run the battery down in extended idle periods.
The timing and momentary parts I think are best achieved using a 555, but the problem is triggering the circuit to stay on during the timing, and switching the entire circuit off again afterwards. Can anyone help?
Thank you!
The key is that the circuit is completely off during idle, so it doesn't run the battery down in extended idle periods.
The timing and momentary parts I think are best achieved using a 555, but the problem is triggering the circuit to stay on during the timing, and switching the entire circuit off again afterwards. Can anyone help?
Thank you!