Re: [CAD_CAM_EDM_DRO] Re: Proper size of capacitors for transient suppression?

On Thursday 13 May 2004 01:22 am, ballendo wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Roy J. Tellason"
>
> <rtellason@b...> wrote:
> >>My original NC controller had capacitors in series with resistors
> >>for this funcion on many of the longer lines.
> >
> > Don't know why you'd want to do that.
>
> Hello,
>
> They're called snubbers.

Yeah, I've run across them used, say, across a set of relay contacts or a
switch, but I didn't think it fit with what he was talking about, unless I
misunderstood...

> They limit the dV/dT (change in volts over time) to safe levels.

Yep.

> Read about 'em at www.stonline in Tom Hopkins paper about using them in the
> output of a L6203 stepper driver. He includes calcs..

I'll have a look, then.