get a 555 to produce a certain number of pulses

I need to get a specific number of pulses out of a 555 timer when it is triggered. The one-pulse monostable is easy, but can I get JUST TWO pulses in any way? The astable 555 is difficult to stop accurately after two pulses.
My start pulse time is 0.5 seconds. I want to get two separate output pulses 0.5 seconds apart.

Posted by juliansilverton (juliansilverton@onetel.net.uk) on 13/06/2003, at 15:50 GMT