Re: [CAD_CAM_EDM_DRO] Power supply question.....

Thanks for the reply.... I do have the Radio Shack book on power supplies,
some help. but not much... And yes both caps are the same, so shouldn't be
a problem, the reason I want to do this, is one, I have them in stock, and
two, the very large cap I need, is also expensive!

Now, what about transformers.... the one I am using has a ct and two end
taps.... when measure with a voltmeter, the ct and one end connection reads
28 vac, but the two end ones read, 32 vac. My question is, can one use any
combination of connection without being a problem?

Thanks again,
RC

----- Original Message -----
From: <JanRwl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, April 22, 2002 7:15 PM
Subject: Re: [CAD_CAM_EDM_DRO] Power supply question.....


> In a message dated 22-Apr-02 05:05:03 Central Daylight Time,
asdf@...
> writes:
>
>
> > 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?
>
>
> Get a copy of some Radio-Shack book, or (much better!) an ARRL annual
> handbook less than twenty years old!
>
> Capacitors IN PARALLEL "add". In series, the total is the reciprocal of
the
> sum of the reciprocals of each.
>
> Resistors are exactly the opposite of that.
>
> BUT, each capacitor MUST be rated at least as high in "working volts" as
your
> proposed total. If you had some reason to connect caps in series (say you
> just HAD to have 50 uF, but had only two 100 uF caps, for example), you
must
> NOT assume the "working voltages" will simply ADD. You must put a large R
in
> parallel with each separate cap (say 10K) for that to approximately work.
>
> Also, it would be best if the capacitors you "add" in parallel are the
SAME
> TYPE, even brand and year of manufacture, of the SAME working-voltage.
Not
> "absolutely" necessary, but probably much more reliable and safer for you
and
> the parts!
>
> Jan Rowland, OLD [deleted] who's been there; done that.
>
>
> [Non-text portions of this message have been removed]
>
>
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