You can use a 555 timer monostable circuit. It's like a single pulse generator. Every time you send a pulse to the input, it generates another pulse that remains high for a certain amount of time. You can Google for the circuit- it's one of the two basic 555 timer circuits.
Sorry, I should of said; I didn't want to use a 555 timer (already thought of this) due to cost, I'm gonna be building 50 - 75 of these so I wanted to keep cost to a minimum. I was just wondering is there any cheap and nasty options??
Sorry, I should of said; I didn't want to use a 555 timer (already thought of this) due to cost, I'm gonna be building 50 - 75 of these so I wanted to keep cost to a minimum. I was just wondering is there any cheap and nasty options??
cos if there is an intermittent contact I'll have a output??? I'm using it if to drive a relay but if the relay is on for > 1.5 seconds it gets very hot.