I have looked everywhere for help with this, and I can't find any. I am trying to construct a mechanism that will rapidly switch a DC circuit on and off, anywhere from 10 to 100+ times a second. Ideally this switch should consume as little power as possible, and should be powered by a 6 volt battery. I have searched for buzzer circuits, but I have had no such luck with that. If anyone can tell me how to construct such a switch, or point me in the right direction, that would be great. I have also tried modified BEAM solarengine switches, except using the battery in place of the solar panel. No such luck there, either.