The Spark -
While working on the tach circuits I captured this picture of what the
voltage is on the point side of the distributor Starting
at the left side, that's when the points open. The field in the coil
collapses and the voltage shoots up to almost 250V. Then it drops down
and goes about 30v negative. It bounces back and forth a while (called
ringing) and the settles at about 12V for a bit. Then they close and
it drops to 0V, ground level.
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