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Re: [Amps] Source for plate xfrmer

Subject: Re: [Amps] Source for plate xfrmer
Date: Tue, 14 Feb 2012 08:33:26 -0500 (EST)
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Hi Ian, a third requirement for good regulation is a stiff ac power  
service. In rural areas this can be a bit of a problem with C filter designs.  
also be a problem in older homes with less than robust wiring. 
Same issue as using 240vac instead of 120vac for better regulation.
Gerald K5GW
In a message dated 2/14/2012 5:39:26 A.M. Central Standard Time, writes:

Rob  Atkinson wrote:
>In your long description you said nothing about the  filter caps in use. 
>Please describe them.  Ideally I would want  one or more oil caps giving 
>around 50 uF with 6  KVWDC

Good regulation requires two things: low transformer  winding resistances 
*and* sufficient capacitance. If the winding  resistances are much too 
high (which seems to be the case with Steve's  transformer) then even 
large amounts of capacitance can only have a  marginal effect.

This has always been apparent in the old paper charts,  and software like 
PSU Designer makes it even clearer.


73 from Ian  GM3SEK
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