> This is my first time on a newsgroup, so pardon me if it is miswritten.
> I am planning to build a rocket with a 35 mm camera in it. I have tried a
> 555 w/ a relay, a LED pulser, and a transistor+capicator circit, but none
> seem to work. there is a 556 circit in the "555 digital IC circit"
> mini-book from Radio Shack, does it work better?? Any timer Ideas
> I want to be able to take as many pictures as possable in one flight.
> Thank you!!
The 556 is just a dual-packaged 555 - no help there. Does the camera
you plan to use have the feature that as long as the shutter is
depressed (electronic switch remains closed) it will take picture after
picture? If that is the case then forget the timer circuit and just
set up so that the shutter is closed at launch and remains closed until
you run out of film - a Normally Closed relay or spring switch held open
with a piece of string tied to the launch pad works good.
Lou Catozzi IBM RS/6000 Division Visual Systems
Tel: (512) 838-4065 Austin, Texas Administration