Hi I am trying to design a TTL circuit, which is based on a NOT-gate (http://en.wikibooks.org/wiki/File:Electronics_TTLNOT.PNG). It has to do the following: When 5V are applied to it, it should deliver a short pulse such to A. The exact length of the pulse is not important at all, what is important is that it does not continously deliver a current. When 0V are applied, a short pulse is to be delivered to [itex]\overline A[/itex]. So basically it almost has to behave the same as the NOT-gate, but instead of a continous signal the transistor should only deliver pulses. I guess I need some simple configuration of transistors. Can someone point me in the right direction? What would be a good place to start? Best, Niles.