RE: [CAD_CAM_EDM_DRO] Re: POWER SUPPLIES

Although I did not look at it on a scope it appears to need the external cap
to smooth the output. I think the output tends to pulse instead of being
smooth DC as you would think. I can put a scope on it to see, but I did not
have my scope working at the time I was fooling around with it.

John Guenther
Sterling, Virginia

> -----Original Message-----
> From: kimvellore [mailto:kim@...]
> Sent: Monday, September 23, 2002 15:30 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: POWER SUPPLIES
>
>
> Just inquisitive, the specs of the power supply says 1% regulation so
> why add extra caps at the output?. It should have enough inside the
> supply itself to work if operated within the specs. Unless you have
> long wires to the load and have a voltage drop due to wire resistance.
> Anyone have a good explanation for it?
> Kim
>
>
> --- In CAD_CAM_EDM_DRO@y..., Randy Gordon-Gilmore <zephyrus@r...>
> wrote:
> > At 11:19 AM 9/23/2002 -0700, J wrote:
> >
> > >in question, it is a switching power supply (rats!). Here's the
> url if
> > anyone wants >to look at it:
> > http://www.mpja.com/product.asp?product=12613+PS
> >
> > Jared, I'm using this power supply with the Camtronics 2A driver
> board kit
> > and Sherline's Size 23 stepper motors. It works fine. I have a 5-
> 6000
> > mfd cap on the output (unit is at home and I'm not, or I'd give you
> an
> > exact number.)
> >
> > Where I work we use stepper motors with chopper drives in various
> products
> > (admittedly mostly Size 17 motors) and don't have a linear supply
> in any
> > of them. I asked our head EE about the linear vs switching power
> supply
> > thing a while back, and he said that the motor will not know the
> > difference.
> >
> > Best regards,
> >
> > Randy
> >
> > Randy Gordon-Gilmore ,----.___________ ______________
> _________________
> > ProtoTrains // = = === == || == == == = || == == ==
> = == =|
> > Rio Vista, CA, USA /-O==O------------o==o------------o==o-----------
> o==o-'
> > zephyrus@r... http://www.prototrains.com
>
>
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