Hi, 

Thank you to all who replied and gave a hint. Now I have good starting
point.

Regards Peter 

> -----Ursprüngliche Nachricht-----
> Von: andy pugh [mailto:bodge...@gmail.com] 
> Gesendet: Freitag, 26. April 2013 16:47
> An: Enhanced Machine Controller (EMC)
> Betreff: Re: [Emc-users] Mill BF30 from Optimum Germany
> 
> On 26 April 2013 15:13, Gene Heskett <ghesk...@wdtv.com> wrote:
> 
> >> Has any body done this for this specific machine before, or has 
> >> anybody a simple schema for a pwm converter to 5V?
> >>
> > While I've not had a need to go that low, most such 
> circuits seem to 
> > be geared toward 0 to 10 volt control signals, I know the 
> C41 can be 
> > turned down that far
> 
> Just to point out that the little circuit I pointed out 
> earlier basically acts like a PWM-controlled potentiometer, 
> so can control any voltage up to the chip max and need not 
> share a ground with the logic side.
> It can be especially useful for such as the KBIC speed 
> controls where the pot floats at +100V relative to machine 
> ground. (The circuit will still work as the optical link is 
> good to 1000s of volts, and the actual voltage across the pot 
> terminals is only 10v).
> 
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
> 
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