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Subject: Re: How to test a power t-former for Amp rating?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Wed, 20 Nov 2002 07:25:39 GMT
NNTP-Posting-Date: Wed, 20 Nov 2002 08:25:39 MET
> HELP. I have a large collection of power transformers taken out of
> scrapped larger wattage power amps and would like to utilize them in
> my projects instead of buying new all the time but have been unable
> to figure out how to test the secondaries for current rating? Voltage
> was easy, but ohm's law didn't seem to do the trick. Any help would
> be greatly appreciated. Thanks!
you cannot measure electrically the rated power of a transformer.
But you can determine the core size and look it up in tables of transformer
manufacturers. These also tell you how many percent higher will be the
secondary voltage open circuited, so you can determine the amperage by
dividing the wattage by nominal voltage. You could also look on the label of
the original amp how much was the mains power rating.
electronic hardware designer
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