Re: Proper size of capacitors for transient suppression?

--- 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. They limit the dV/dT (change in volts over
time) to safe levels. Read about 'em at www.stonline in Tom Hopkins
paper about using them in the output of a L6203 stepper driver. He
includes calcs..