Hello everyone.. Im looking to build a very simple circuit. Basically what I need to do is build a timer circuit that creates a short(or trigger a relay) every 30 - 90 seconds. The operating voltage will be about 4.5 vdc. I have a camera flash that goes to sleep after 90 seconds of inactivity and I need to short 2 pins every 30 - 90 secs. to keep it alive even if just for a millisecond. Any tips or suggestions appreciated. Thanks.