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.

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There are only 4 parts to each CD system (not counting the high voltage power supply)
IGBT, 1mF cap (two 1mF caps are optional) , CD 4049 inverter buffer and a hall effect sensor.

One of these systems is required for each rotor if waste spark coils are used
to fire upper and lower plugs. This circuitry can be placed on the hall effect sensor
mounting board. A six or eight volt power very low current  power supply is also
required for the hall effect sensors.


Paul Lamar

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