I am experimenting with an HDD actuator arm to control its movement with current supplied by a transistor capable of sustaining a constant collector current of at least 300mA. I want to be able to vary the base current with an analog signal from a potentiometer or other analog source. The aim is to use the actuator as a variable force lever. The experiment I have conducted so far consisted of applying 5 VDC to the coil at 300mA and keeping it that way for 24hours with the coil getting barely warm. I would appreciate help with a circuit that will do that.
Sincerely,
Ralf
Sincerely,
Ralf