ok, let me explain this thing first: what i want to do is build a circuit that will start then stop a stop watch when a LED goes on then goes out. so the operation would be like this: LED turns on -> start watch; (after a while) LED goes off -> stop watch.
now my plan is to get a working stop watch then build a circuit that will preform the tasks listed above. the problem is that i have absolutely no idea of where to start, which is why i came here. because the stop watch is activated by connecting a circuit, and then stopped by connecting that same circuit; all i need is a circuit that will close a circuit for a short time then open the connection, when power is applied to the inputs. then when power is disconnected from the inputs the circuit will close the circuit again for a short time then open it. i know this sounds hard and confusing but its really way over my head. if anyone has any circuit that will do this please post, any help is welcome!