Re: [CAD_CAM_EDM_DRO] Cap voltage rating (was Re: Power supply question.....

> should be 1.414 * voltage roughly
>
> the other thing to remember about computer ps's is that they run at much higher freq than a std 60hz brute force linear
>
> dave_ace_me wrote:
>
> > Hi Scott and all,
> >
> > I've been reading the threads about power supplies and caps and
> > transformers and all with great interest.
> >
> > Seems to me that the preference is Torridoidal transformers and huge
> > capacity cap's, but the cap's voltage is not suposed to be lots more
> > than the expected voltage of the system. is: if you plan on a 35 volt
> > power supply, 24 VAC trans + cap, a 50Volt cap would be good, but a
> > 100 Volt cap would actually not be a good choice.
> >
> > On my 12 supply from my computer, it has 500 volt cap's. it is a
> > dual power, 220/110.
> >
> > Then there is the voltage increase from the steppers when not being
> > driven, but still spinning.
> >
> > Is there a good rule of thumb (or actual engineering principals ?)
> > to size a capacitor ?
> >
> > Dave
> >
> > --- In CAD_CAM_EDM_DRO@y..., scott wilson <swilson@d...> wrote:
> > > have seen several pwr supply questions about caps....and it seems
> > to me that if they are being used as brute filter caps people are
> > using way to low a working voltage....in this case i would feel much
> > better with a 80-100v rating....and yes you can put them in parallel
> > >
> > > RC wrote:
> > >
> > > > Building my first power supply, needs to be approx. 42 volts @ 10
> > amps.... I will need a cap with a 19,000 mf value with at least 50
> > v. rating, the question I have is, can one "add" the mf values,
> > instead of using one large cap? And if so, how would they be
> > connected, series or parallel?
> > > >
> > > > Thanks,
> > > > RC
> > > >
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> OFF Topic POSTS: General Machining
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> http://groups.yahoo.com/group/jobshophomeshop I consider this as a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
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