I have an old fashioned distributor that fires a strobe as the points of the distributor being tested open. I want to test a four contact rotary switch (a model T Ford timer) so that the strobe fires when the switch closes. I tried a conventional relay, but the point bounce caused multiple firings of the strobe. My thought is a flip flop that will open when the switch closes and stay open for 20ms or so. Can someone point me in the right direction?