[Johnson] Need tech advice on xfmr

[C E]

Guys, GUYS! Never mind. I'm purchasing a 700 VCT, 175
mA transformer for the duty. It should more than take
care of my 100 mA current demand "problem." Cal. 

--- "David C. Hallam" <dhallam at rapidsys.com> wrote:

> Ed,
> 
> Unless some of the transformer guys weigh in and
> show me that I am wrong, I
> will stick by my contention that the transformer is
> rated for approximately
> 25 watts in CONTINUOUS duty service with the center
> tap grounded.  I will
> agree that for intermittent duty service with a
> light bleeder load, you can
> get for than 25 watts out of it.  Leaving the center
> tap above ground does
> not increase the power rating of a transformer.
> 
> -----Original Message-----
> From: Ed Tanton [mailto:n4xy at earthlink.net]
> Sent: Saturday, November 26, 2005 9:52 PM
> To: dhallam at rapidsys.com; C E;
> johnson at mailman.qth.net
> Subject: RE: [Johnson] Need tech advice on xfmr
> 
> 
> Not correct: IF the transformer is indeed rated for
> 520VAC at 90mA,
> then (regardless of the CT) it is capable of ~ 46W.
> Period.
> 
> At 01:24 PM 2005-11-26, David C. Hallam wrote:
> >The answer is maybe.
> >
> >The transformer rating is approximately 520/2 x
> .090 = 23.4 watts.
> >Depending upon the size of wire used to wind the
> transformer you could
> >probably get 120 mA at 260 VDC out of it. 
> Breadboard the rectifier circuit
> >and let it run for awhile and see how hot the
> transformer gets.  If it gets
> >too hot to touch, the answer is no it won't work.
> >
> >No, it is not rated for 180 mA in a FWB.
> >
> >73
> >David
> >KC2JD
> >
> >-----Original Message-----
> >From: johnson-bounces at mailman.qth.net
> >[mailto:johnson-bounces at mailman.qth.net]On Behalf
> Of C E
> >Sent: Saturday, November 26, 2005 1:05 PM
> >To: johnson at mailman.qth.net
> >Subject: [Johnson] Need tech advice on xfmr
> >
> >
> >Speaking of xfmrs, I would like to know (say, a
> >replacement xfmr for an EFJ transmitter) is rated
> at
> >520 VCT at 90 mA and I would like to use it in
> another
> >application that requires 260 VDC at 120 mA, would
> >this transformer work without getting fried? Does
> the
> >90 mA mean 180 mA in full bridge configuration?
> >Thanks. Cal.
> >
> >
> >
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> 
> Ed Tanton
> 
> website: http://www.n4xy.com
> 
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