>My basic ignition circuit (i.e. the Hall sensor,
>two transistors, three resistors and a coil only
>'fires' when the magnetic field leaves the Hall sensor.

You may get away with this using a hall sensor, but do be aware that if you
use a pickup coil you may well get some automatic advance with change in
engine speed. The amount you get is dependant on the shape of the magnetic
pole pieces and the resultant rate of magnetic flux change in the coil.

I believe this effect is used in magnetos to give automatic advance.

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