[sdiy] How to predict a tansformer's current capability?

Rob B cyborgzero at home.com
Mon Dec 24 14:46:35 CET 2001

There is something.. It has to do with wire gauges times the length of
wire..You can find it on the net.


----- Original Message -----
From: "Glen" <mclilith at ezwv.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Monday, December 24, 2001 1:37 AM
Subject: [sdiy] How to predict a tansformer's current capability?

> I have some assorted used power transformers that have been removed from
> various types of equipment. I'd like to use some of these for projects,
> how do I predict what the maximum safe output current would be for a
> transformer that I have little or no information about? I can determine
> primary and secondary windings with no problem. I can hook them up and
> determine the output voltages with no load, but how do I determine the
> maximum load the transformer should be subjected to? I'm more interested
> a "continuous use" specification, instead of a peak current rating, but a
> peak current rating might be useful for some things as well.
> The transformers are a varied assortment. Some have multiple secondaries,
> perhaps a few have multiple primaries. Some transformers have "step-up"
> secondaries, but most are the "step-down" style.
> Do I just power one of them up, while increasing the load on the
> and monitor the secondary's output voltage? (Perhaps I would stop
> increasing the load, when the output voltage has dropped by some
> "safe" amount, whatever that amount might be, and declare the amount of
> current flowing at that moment to be the maximum rating.)
> Thanks for any assistance,
> Glen Berry

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