Original poster: "JRW by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jwhitmor-at-muscanet-dot-com> I need a "Very-Low ESR" capacitor that can take millions of repeated pulses. The voltage is not problematic (15vdc source, but rings up a bit). You guys certainly seem to be the pulse cap experts. Am I incorrect in thinking a photoflash rated cap. should work if operated conservatively? Thanks, Jimbo