Another of the many similar configurations we have in this section. This one is from a Radio Electronics magazine from June 1985. The transistor is according to the power of the controlled motor.
This circuit was obtained from an American 80's documentation. The balanced mixer can be shown in...
This circuit was found in a 90s Electronic Engineering. The quadruple operational amplifier can be...
I found this circuit in an English publication from 1989. This configuration can be mounted with...