Re: Servo amp connections needed. Where should I go from here?

Thanks Peter,
this is starting to make more sence. I was thinking I could be
smarter than the amp. Not thinking of the opamp comparison that
actually derrives the output was a bit silly.
That's why I'm ask'n, so I be learn'n. This is my first attempt at
building a simple system. I have worked with others that were all
ready designed and required tuning after parts were replaced.

I will look around for a tach. Then I may be back to bend a few more
ears on the subject.

Thanks to All,

DC

--- In CAD_CAM_EDM_DRO@y..., "Peter Seddon" <peter@s...> wrote:
> As a previous post said the gain of the input amplifier will be
quite high
> so even a small input signal will have the effect of driving the
amp to
> saturation. Under normal circumstances the tach signal is of the
opposite
> polarity to the input signal and the difference between input and
tach is
> very small due to this high gain amplifier. Sometimes you can
degain the
> input amplifier with a jumper or resistor so that you have a low
gain on the
> input. Even using the ideas in your post the amplifier will have
limited
> control due to the high input gain.
>
> Regards Peter