[ARC5] Fwd: Salvaged Transformer

[Rich Post]

From: Rich Post <kb8tad at gmail.com>
Date: Wed, Feb 24, 2021 at 5:52 PM
Subject: Re: [ARC5] Salvaged Transformer
To: Robert Eleazer <releazer at earthlink.net>


Hi Wayne,

Have used these UPS transformers numerous times for low volt supplies,
bucking, etc.  Use a dim bulb (incandescent light) in series with the
Variac feed.  Highest resistance is USUALLY the primary but if the dim bulb
lights, stop.  I have also been known to feed the likely primary with just
a few volts and measuring the others to determine winding ratios.

73 de Rich KB8TAD



On Wed, Feb 24, 2021 at 5:27 PM Robert Eleazer <releazer at earthlink.net>
wrote:

> I salvaged a big transformer out of a unit that I guess was a Trip Let
> UPS.  All the windings have low resistances, around a few ohms.  Anyone
> know how to tell which winding can be attached to 120 VAC to get something
> useful?
>
> I could use a Variac to bring up the power at low voltages.
>
> Thanks,
>
> Wayne
>
>
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