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Re: Power Factor Capacitor -- Was -- RE: schematics...Adam Smith's
Connecting two electrolytics in reverse parallel would not solve the
problem, commercially if one needs a large value unpolarised cap, it is more
normal to connect them in series, but with opposite polarity. I have done
this many times, for example for a low powered reversible synchronous
motor, in an antenna rotator, when I have been unable to obtain the correct
value component in a single can.
Steve
----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, February 27, 2000 1:43 AM
Subject: Re: Power Factor Capacitor -- Was -- RE: schematics...Adam Smith's
> Original Poster: "Jan Florian Wagner" <jwagner-at-cc.hut.fi>
>
> Hi,
>
> > Actually, I've been told that Aluminum Electrolytic will work for a
120VAC
> > PFC cap.
>
> For giving the start current for a motor maybe, but to match a
> transformer!? Definitelty not advisable.
>
> > And to head off criticism that Aluminum electrolytic caps shouldn't be
> > used in an AC circuit, I was told by an Electrical Engineer
> > He said that electrolytics can take the AC, just not a constant negative
> > DC bias.
>
> Have you sometime tried placing a electrolytic cap to your audio line in
> input of the soundcard (or scope), and then record a bit?
> You'll get only one part of the signal, the other half is clipped away.
>
> The same thing would happen with an elko. One half cycle the cap matches
> out the NST and there's no phase shift, on the other cycle the mains will
> see just the NST and the ~90deg phase shift.
>
> But... hmm.. maybe it'd be possible to use two caps in parallel
> connected with the polarities in opposite?
>
> --
> *************************************************
> Jan Florian Wagner
> http://www.hut.fi/~jwagner
>
>
>
>