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On 30 Jun 2002, at 23:42, Dave Hall wrote: > Could it be something to do with back emf being in the opposite direction to the > applied emf? I think it's just a myth. The capacitance is there to prevent the voltage at the points from rising faster than the points open, so that a spark has no chance to jump across. While it is true that the coil and capacitor form a resonant circuit, the actual resonant frequency doesn't really matter, and the direction that the current flows is the same, at least immediately after the points open, regardless of the frequency. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/