re:stepper pwr suplies wasRe: motor/leadscrew/ps recomendations

--- In CAD_CAM_EDM_DRO@egroups.com, "Roman Black" <fastvid@e...> >

> From the output of the switcher use a small
> series resistor, say 0.5v drop at max current,
> and then add some big filter caps of a high
> quality low impedance type like used in audio
> amps. Most stores sell these. also there should
> be about a 1/3 of your total capacitance value
> as close to the driver bridge as possible,
> as usually these are some distance from the
> power supply and main caps.
> -Roman

I was just going to connect a cap between the output and ground. I
need a series resistor?

It's been a couple of decades. Let's see, how do I figure the value
for a .5v drop at 6 amp, with a 28v supply?

Ah, never mind. Don't you love the Internet? "1 ohm will cause
currents of 1 amp to drop 1 volt, or currents of 10 amps to drop 10
volts"

So, 1 ohm would cause a drop of 6 volt, I would need 1/12 ohm to get
a drop of .5 v.

So, I would need a 1/12 ohm resistor, rated at 6*.5= 3 watts?

Where would I buy a 1/12 ohm resister? Radio Shack?