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Re: [Amps] Limits of a Power transformer

To: "Ian White GM3SEK" <gm3sek@ifwtech.co.uk>, <amps@contesting.com>
Subject: Re: [Amps] Limits of a Power transformer
From: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 2 Aug 2006 06:53:25 -0400
List-post: <mailto:amps@contesting.com>
>>I think you'll find a 160 ohm ESR transformer has horrible
>>regulation.

> Don't forget the effect of primary resistance. It may seem 
> low (often so
> low that it's difficult to measure accurately) but the 
> value has to be
> multiplied by (turns ratio)-squared, and then added to the 
> secondary
> resistance.

I should have been clearer. Of course the ERS is a 
combination of losses that are the effective resistance.
We can be sure the actual ESR is always higher than the dc 
secondary resistance.

73 Tom 


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