The boost of the supply voltage is shown for a real music signal.
Incandescent lamps are very sensitive to changes in the supply voltage.
Furthermore, the charging time is inverse-square to its supply voltage.
The trend towards lower supply voltage therefore works against the goal of high clock speed.
Output power is 6 watts from a supply voltage of just 7.5 volts.
The little-used negative supply voltages, however, have a 10% tolerance.
Now consider a differential system with the same supply voltage.
At lower supply voltages a different mode of operation takes over:
The main difference between the 6581 and the 8580 is the supply voltage.
A large supply voltage and phase resistance are only required when the motor is operating at high speeds.