Re: Power supplies (correction)

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bill Kichman"
<billkichman@c...> wrote:

> Hmm....not to split electrons, but for the sake of clarity to the
> non-formally trained electrical aficiondos out there, did you

really mean to

> say that an undersized cap would possibly cause it to smoke?

Undersizing a

> capacitor will cause ineffective DC smoothing, which is why it is

there in

> the first place, however will never to my knowledge cause failure

of the

> cap.
>
>
>

Actually...
A severely undersized Filter Cap along with other factors,
such as loads, can overheat and loose it's juices.

Caps, especially Electrolytic have an internal resistance
that comes into play when filtering the AC component.
Normally this can be ignored, however, under certain
conditions, it needs to be part of the equation.

Electrolytics specifically designed for heavy filtering
will typically specify a lower internal resistance.

Excessive "A.C. Ripple" and a Hot Cap, is a sure sign of
the need for a larger size.

Tom M.

>
>
>
>
>
>
> R. William Kichman, P.E.
> Kichman Engineering Associates
> 103 Old Furnace Road
> Cornwall, PA 17016-0643
> tel/fax 717/270-0714
> ----- Original Message -----
> From: "dougfennell2000" <dfennell@m...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Tuesday, July 29, 2003 10:12 AM
> Subject: [CAD_CAM_EDM_DRO] Re: Power supplies
>
>
> > Mike, let me correct an error I made in an earlier post - Doug
> > Fortune is right; I left off a zero - the cap needs to be a

22,000mfd

> > cap and not a 2200mfd. It will be about the size of a can of

coffee

> > creamer. If you use a 2200mfd cap you will let the smoke out of it
> > <g>.
> >
> > Doug Fennell
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "mmeyers1111"
> > <mmeyers1111@y...> wrote:
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Tim Goldstein"

<timg@k...>

> > > wrote:
> > > > > -----Original Message-----
> > > > > You freak'n guys in this group are like the ham radio guys

20

> > > years
> > > > > ago. Ya'll understand what each other are saying, but

people

> > > like
> > > > > me of less intelligence turn to the person next to them and
> > > > > go... "wa did he just say???"
> > > > >
> > > > > That might not sound like a compliment, but it is. Kinda
> > > backhanded
> > > > > of course.
> > > > >
> > > > > Now listen... I'm an idiot ok? So get the ham

radio 'belittle

> > > the
> > > > > stupid redneck' thing over and cough it up... where might
> > > someone
> > > > > like me get a wiring diagram of that power supply you just
> > > > > described?
> > > > >
> > > > > You guys always make newcommers pay dues via embarrassment
> > don't
> > > > > ya??...
> > > > >
> > > > > he he ha ha :-)
> > > > >
> > > > >
> > > > > Mike
> > > >
> > > > No one is trying to embarrass anyone. There are a number of

great

> > > > references we steer anyone that asks towards. If you have not
> > read
> > > the
> > > > stepper white paper on the Gecko Drives site than that is the
> > first
> > > > thing you need to do to start bootstrapping yourself to some
> > > knowledge.
> > > > In the power supply section page 3 you will see a schematic

of a

> > > basic
> > > > linear power supply.
> > > >
> > > > http://www.timgoldstein.com/cnc/geckoG320wiring.htm will show

you

> > a
> > > > power supply as part of connecting some Gecko G320 drives. It

is

> > > using 2
> > > > transformers along with the switch and fuse that is not in the
> > more
> > > > basic circuit in the Gecko white paper.
> > > >
> > > > Tim
> > > > [Denver, CO]
> > > > Sherline & Taig products at Deep Discount
> > > > Mach1 & DeskCNC with credit card ordering
> > > > www.KTMarketing.com/Sherline
> > > > e-mail me at Timg @ KTMarketing.com for items not yet listed
> > >
> > > Ha ha only 1/2 kidding Tim... however, you guys are in a class

all

> > > by yourselves *Twilight Zone music playing in background*
> > >
> > > Thanks so much to everybody for the postings re my question on
> > power
> > > supplies. Wow! Very helpful!
> > >
> > > Mike
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> >
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wanliker@a...,

> timg@k...
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