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 was found in a 1970s General Electric documentation. Transistors are uncommon today....
When the lights turns off this circuit will produce a sound like a cricket. When the lights are...
Found in National Semiconductor documentation this circuit converts a rectangular signal into an...