Dwell Angle Control

This circuit controls the length of time the power transistor (current flow through the primary circuit) is turned on.

The length of time during which current flows through the primary coil generally decreases as the engine speed rises, so the induced voltage in the secondary coil decreases.

Dwell angle control refers to electronic control of the length of time during which primary current flows through the ignition coil (that is, the dwell angle) in accordance with distributor shaft rotational speed.

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