I've been trying to find a circuit that is normally off, then when a button is pressed it will wait x seconds (say 10-20) and then give a pulse out (to a switch blah blah blah triggering a buzzer got that sorted), so I was wondering if it was simple enough, I've seen the monostable mode 555 but that starts the pulse instantly, or if sinking current it is normally on which triggers the buzzer circuit straight off which is undesired!
I would like to be able to use the 555 chip but other circuits are welcome.
Thanks everyone.