For experiments with a disk rotating at various speeds, the April 1998 Electronics Now magazine suggests this PWM motor control. The current with the LM317 is 1.5A maximum.
This circuit is a high voltage source for a gas LASER. We found it in a documentation from the...
With this circuit it is possible to control a current of several amps, depending on Q1, from a low...
Datasheet of We found this circuit in the 1982 SGS Linear Integrated Circuits manual. A | table...