Suggested by Sprague in the 90's documentation, this circuit applies to AC motors. The documentation does not indicate the maximum engine power that can be controlled.
L1 is the secunday wound of a common power transformer with voltages between 6 and 12 V and...
With 12 V of power and 8 ohms in each speaker we have 1.6 W of power per channel. With a 22 V...
This circuit is from the time when seat belts were still being adopted. Obtained from a 1976...