At 12.33 2010.01.20, you wrote: >The capacitor is also part of the LC circuit formed by the discharge capacitor >and the primary of the high voltage transformer. The LC circuit will produce >some ringing which in turn may give a longer duration for the spark. And the ESR will directly affect the Q of the system, thus the spark duration.. >The ESR is so low compared to other impedances in the circuir during the >discharge so I don't think it will matter too much for the timing. Use a low >ESR to keep temperature rise to a minimum. This may be a problem depending on >how often you need to produce a spark. Racing, high RPM 2 stroke engine.. and anyway I'd like to play with multispark, so.. ;) Cheers, Mario -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist