Re: power supply question

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "curious925072002"
<ferguson@m...> wrote:

>
> Dear Chris,
>
> 10,000 or maybe 12,000 is probably OK but 22,000 is too much. I have
> been interested in this problem for a long time. Larger capacitors

put

> additional stress on several components--most seriously on the
> transformer--which is, after all, the most expensive component in

the

> power supply. The exact technical reasons are very interesting to me
> but this is not the place to discuss them.
>
> Sincerely,
> Barry

Hi Barry,

I think we are all curious about why a cap may be too big.

Since we do know that there are systems that need that size cap and
there people who use that size, we do know it can be used.

If it is not recomended, I for one, would be interested.

There are arioius inrush limiting technologies or circuits that
people use when using that big of a cap with a torid transformer.

We also know that Mariss's circuit is designed to have an acceptable
ripple, not to eleminiate any ripple.

I started using a couple smaller ones to reduce the space needed in a
box, and to reduce the ESR from one large one.

But why it is inadvisable to use one that large is something many of
us are interested in.

Please elaborate !

Dave

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "cutthroatplasmaco"
> <cutthroatplasmaco@y...> wrote:
> >
> > Hi all,
> > Is there anything wrong with running a capacitor on your power

supply

> > that is somewhat larger (or for that matter, smaller) than what

is

> > being called for? For instance my calculations call for an

8,000uf cap,

> > but I have on hand a 22,000uf... is there anything wrong with

using

> > that?
> > Thanks,
> > Chris