I just snagged me 2 of these; wow
I have the basis for 2 3 axis systems right there

The 4113 provides three independent current amplifiers. Each amplifier channel can also drive one brush motor in multi-axis applications
Each of the three channels of the 4113 can drive an independent motor
or inductive load. (These may be dc brush or other single-coil motors, or
multi-coil motors such as stepper or brushless motors where the coildrive
signals originate in an external controller)
Can anyone explain just what that means i bracketed (mainly external controller)

http://www.warshipmodels.com/~SteveN...copley4113.pdf

I got the 2 NIB for $*.** each or basically free