Re: Aftermarket electronic ignition module fried in my Masse

Posted by Texasmark1 on March 16, 2015 at 19:11:45 from (162.72.24.91):

In Reply to: Re: Aftermarket electronic ignition module fried in my Masse posted by hot wrench on March 16, 2015 at 18:32:42:

As I recall Petronix uses a magnetic pickup. I've installed several
for myself and friends but that was many years ago.

There is a metal star that goes over the distributor shaft (where
the cam lobes are that operated the points) with fingers
corresponding to the number and location of the cylinders to be
fired.

There is an electromagnetic pickup mounted where the points
were mounted whose purpose is to "sense" the presence or
absence of the fingers. As a finger passes the magnetic pickup
it induces a pulse which is sent to the triggering switch, SCR or
MOSFET and fires it. The switch stays on until the backswing off
the coil pulse, of reverse polarity shuts it off if an SCR, MOSFET
shuts off when the trigger disappears.

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