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 configuration with the LM111 was found in your factory manual. The circuit can be implemented with...
This circuit, with a 12 V input, was found in a Popular Electronics from the 1990s. Information is given...
This amplifier can be powered with voltages between 2 and 5 V with power up to 100 mW. The minimum...