I have a couple of simple 555 monostables, the first to delay the triggering of the second.
But I'm struggling to extract the brief -ve pulse required for the Main mono. I thought it would prove simple. But bread-boarding various combinations of R, C, diode and NPN or PNP transistor has so far not yielded a winning combination.
All suggestions would be appreciated please.
Terry, East Grinstead, UK