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 1985 documentation. It provides an audiovisual indication of the...
This transistorized shift register was found in a 1970s RCA documentation. The used transistors can...
We found this circuit in a 1965 General Electric manual. The components are from the period. Time...