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Article #33

Re: power supply circuit

#33
From: Phil Allison
Date: Mon, 09 Jun 2008 23:29
43 lines
2368 bytes
"Don Klipstein"

>  One thing to watch for:  RMS current being drawn from the transformer
> exceeding the DC output current.  The bigger the filter capacitor, the
> worse this gets.


** That last claim is   ABSOLUTE   BULLSHIT  !!!!

Nothing new for this ignorant, septic asshole to make them.


>  Assuming that you will be using an adjustable voltage regulator, you
> should be OK with a few volts of filter capacitor ripple, so don't make
> the filter capacitors too big.


** Make it as big as you like and the rms ripple current will not increase.


>  As for a filter capacitor value:  4 volts ripple at 4 amps over the
> approx. 6 milliseconds or so that the capacitor has to supply current
> works out to 6,000 microfarads.  I would not use more.  Greater filter
> capacitance makes the current waveform drawn from the transformer spikier,


** No it does not !!

The whole idea is an idiotic  MYTH  put about by complete fools like 
Klipstein.


> which makes the RMS current drawn from the transformer greater.  I might
> go for 4700 microfarads and only count on drawing 3-3.5 amps DC without
> overheating the transformer.


** 20,000 uF would be a good value to use -  cos increasing the filter 
capacitance above the minimum usable value has no effect on the rms current 
in the transformer windings.


......   Phil
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From: "Phil Allison" <philallison@tpg.com.au>
Newsgroups: sci.electronics.basics,sci.electronics.design,aus.electronics
Subject: Re: power supply circuit
Date: Tue, 10 Jun 2008 09:29:06 +1000
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