I had to add a .1 mF and a 47K resister. I suddenly realized that in
the remote chance a magnet stopped in front of a hall sensor the IGBT
would stay on and burn out the 1K 25 watt resister or maybe destroy
the high voltage power supply or IGBT. Something would have failed.

The 47K/.1 mF combination  circuit is called a half one shot.

It will not pass DC. The engine must be turning over however slowly
for it to work.

That is one thing Hall Effect sensors do that VR CAS sensors do not
do. Not enough however, to not use Hall Effect CAS sensors :) They
put out full pulse voltage at near zero RPM.

Paul Lamar


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The 8 to 40 volt input 300 Volt DC out high voltage power supply can be had
direct from Linear Technology for $125

http://www.linear.com/demo/dc1322a


I bought one and will test it as soon as I get it. I plan on using it
for the RV4 stand alone CD ignition system.

I can make it for less than this.

There are several CD ignition options for a 2 rotor.. In order of
redundancy and cost.

1.One power supply, two CD modules, two waist spark coils. Lowest
cost. 2.Two power supplies, two CD modules, two waist spark coils.
3.Two power supplies, four CD modules, four simple spark coils.
4.Four power supplies, four CD modules, four simple spark coils.
Highest cost.


Paul Lamar


I noticed that the specs for the demo circuit say that 1 sec is required
to charge at 8V.  Even the 400 ms at 40V seems a little long.  How do you
deal with that?

Gary Knutson

Very astute question. Good thinking Gary.

That is an on board 400 uF capacitor so it takes awhile to charge.
However once it is charged it can dump into the 1 uF CD cap rather more quickly
I expect. One of the things I want to test.

Paul Lamar


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