Electronic Ignition

[thomas walter x5955]

> Not exactly efi but still related, would someone explain the input circuit 
> of a ignition module driven from a magnetic pickup.  The magnetic pickup 
> output is a low level AC signal and it drives what? 


Input circuitry would be a comparator. The signal will grow with
rpms, some some sort of gain circuitry should be used to provide
an offset reference.  Darn, really wish I could sketch a simple
circuit (It is pretty straight forward once you see it).

Might be easiest to try to find a datasheet for a "High
Energy Ignition Circuit" such as the Motorola MC3334P. (The
datasheet note "designed to serve the aftermarket Delco five
terminal ignition applications").  Hmm, not sure if that device
is being built anymore (it is listed in my '88 edition of the
Motorola Linear and Interface databook).

Tom Walter
Austin, TX.