I cut the voltage to 420 from 560 because I have not received the 650 Volt 1 mF
capacitors yet. This is about 1000 RPM. Watch the movie and you can see
the blue flashes in the middle of the screen. The circuit is basically the same
as the outboard/Vespa circuit but the high voltage power supply works off
a 110 volt wall socket instead of a charging coil. I am using the latest
hi tech solid state switch called an IGBT instead of an SCR shown in the
outboard schematic.


  IGBT Insulated-gate bipolar transistor is a three-terminal power semiconductor device
primarily forming an electronic switch and in newer devices is noted for combining
high efficiency and fast switching. It will dump up to 50 amps through the coil primary
winding in less than a microsecond. The coil is basically used as a pulse transformer
so it runs much cooler than when used in  an inductive mode. It also fires immediately so
there is no dwell time needed. In this set up I am using a stock 2nd gen Mazda coil
with out the igniter.

The 1 mF 450 Volt cap is charging through a 1.5 K resistor hence the visible charging curve
you see on the O-scope. This high value resistor  may not work at the higher RPM's but
prevents the IGBT from shorting the high voltage supply. I plan to experiment with a choke instead.


Paul Lamar

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