> The ones I built used a 22uF / 400V (or maybe 450V?) capacitor > with a similar tube I've got 22uF on this now, which is a little over 1J. I'll track down some disposable cameras - from a film processing lab probably - and get their flash units / tubes for dissection and experimentation -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist