Questionon isolation transformers

[Al Parker]

Hi Ted,
    One thing that wasn't mentioned, if you do use back to back xfmrs you
need to watch the power rating of each xfmr.  If your rcvr draws, say 80
watts, at 120v that's abt 3/4 amp.  But if you use 12v xfmrs, then the
secondaries are going to have to be rated for 120/12 x 3/4 = 7-1/2 amps,
with no "Kentucky windage" for losses.  That's a fairly husky xfmr.
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info


----- Original Message ----- 
From: "Ted Bruce" <kilocycles at YAHOO.COM>
To: <BOATANCHORS at LISTSERV.TEMPE.GOV>
Sent: Wednesday, April 13, 2005 10:44 AM
Subject: [BOATANCHORS-TEMPE] Questionon isolation transformers


> What differentiates isolation transformers from other
> types?  If I were to use, say a 110VAC to 12.6 VAC and
> connect that to a reversed 12.6 VAC to 110 VAC, would
> that combination qualify as an isolation transformer,
> functionally?  I've been thinking of doing a back to
> back transformer in an S-38B that Ive restored.
>
> The schematics I've seen of isolation transformers
> don't look like this (a regular transformer):
>
> ---\  |  /---
>    /  |  \
>    \  |  /
> ---/  |  \---
>
> Hmm, actually that's pretty pathetic; nothing looks
> like that.  Anyway, the isolation transformer
> schematics have a common winding, or something; I
> can't recall exactly.
>
> 73,
> Ted  KX4OM
>
>
>
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