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


Congratulations on the spark!

Henry


Thanks henry. What do you think of putting a diode across the coil to aglow the coil to ring?

Paul Lamar


   The Rotary Engine News Letter. Powered by Linux.
   ACRE NL web site. http://www.rotaryeng.net.
   You Tube http://tinyurl.com/beqqxas.
   Copyright 1998-2013 All world wide rights reserved.