Re: Servo amplifier boards

John -

While a differential input amplifier can be referenced to ground, it is intended to be used with double-ended input signals that are not referenced to ground. It is especially useful for receiving and amplifying a
low-level signal in an electrically noisy environment - i.e., almost any machine shop ... check the link for a brief explanation:

http://www.microlink.co.uk/diffamp.html

- Lou

> Thanks, for the info. I found out the crash problem the hard way! The
> X-Axis is now "stuck" (and the amplifier doesn't like it much at all), so
> I'll probably have to reverse the signal wires and let it "drift" the other
> way for a while. What does differential input mean? There is a selector on
> the amp for diff. input; does that mean it's not a standard ground? I'll get
> this thing fingered out yet...!

> John