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.
To fit the integrated circuit under test, we used an 8-pin DIL socket. Observe the fitting...
This receiver can be used to receive signals from the previous circuit transmitter. The circuit is...
This is the 1968 MR480 commercial cassette recorder circuit. The circuit was fully transistorized and...