Re: Voltage Regulators

On Sun, 19 Feb 2006 20:57:11 -0600, "Abstract Dissonance"
<Abstract.Dissonance.hotmail.com> wrote:


"Pooh Bear" <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote in message
news:43F929B6.528BF401@xxxxxxxxxxxxxx


Abstract Dissonance wrote:

the filter cap is a 200V @ 1mF

What do you mean by 1mF ? It *should* mean 1000uF but popular US usage
( why
are Americans *always* so bloody minded ? ) was to use mF = uF.


cause it makes complete sense. m = *m*illi, u = micro cause u looks like
the greek symbol from micro that is often used. I don't see a problem with
it? Just cause someone started a bad trend should we keep on perpetuating
it?

If you have 1uF, that's your problem.


well, its not.

A 1 milliFarad (1000 uF) 200 volt capacitor would be very large.

If the capacitor is marked "1mF", then I suspect that it is almost
certainly 1 uF - you need a much larger value for your primary filter
capacitor - 1000uF at 50 V would be a good start.

For historical reasons, "mF" = "uF" - in ancient times, a 1000 uF (or
1 milliFarad) capacitor would have been impossibly large - no-one
would have a use for such a thing, so, as the Greek alphabet had not
yet been invented, we used "mF" to mean "microfarad" - that practice
is so deeply ingrained in the culture, that it is very undesirable to
use "mF" for anything other than microfarads.

--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
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