I have a situation where I'd like to delay the closing of an off the shelf relay by ~5 seconds. Assuming it is a 5V coil, and switching 12 V, I'd like the following:
t 0:00: 5v applied to input, relay switch open.
t 0:05: coil closed, relay switch closes.
I think some simple RC network may do the trick, but I'm struggling to imagine the right configuration. Any ideas?
Best Answer
simulate this circuit – Schematic created using CircuitLab
A CMOS schmitt trigger 40106 or 4093 (check the numbers) would work for this.