We found this circuit in the July 1994 Radio Electronics magazine. The circuit uses a general-purpose transistor, and the power supply can be up to 12 V depending on the relay.
This low-pass circuit was found in the December 1990 issue of Radio Electronics magazine. The...
12 V motors and current up to a few amps can be controlled by this circuit that we found in a 1991...
We found this circuit in a 90's European schematic. The circuit can be implemented with almost any...