[TR] Electronic ignition systems

[dave1massey at cs.com]

And even with points, the rise time is very fast compared to engine
rotation.  I doubt you'd see the difference on a scope.








Don't forget the condenser.  When the points open the current flowing through
the coil now flows through the capacitor (er, condenser, excuse me) and the
voltage across the capacitor (er, condenser, excuse me) will rise at a rate
based on the current flow and the value of the capacitor (er, oh, never mind)
following a first order differential equation.  That is why the engine won't
run without a good condenser.

This voltage rate of rise is slow enough to make the rate of point opening
irrelevant in most cases.

I've never taken apart a Crane unit (I've never had one fail) but I suspect
that there is the equivalent condenser inside there for the same reason.  Most
flybacks have some sort of rate-of-rise control.

Dave