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'[PICLIST] Custom transformer source anyone?'
2002\06\20@085542 by Chris Loiacono

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Does anyone have a source for custom PC mount transformers that they can
share?
I need to convert a 7805 based supply from a 230VAC line to 277V and 230V
'standard' transformer primaries are only OK'd for use 10% above their rated
voltage. I am hoping to be able to have a few specials wound, but I need a
source.....anyone, please?

TIA,
Chris

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2002\06\20@090753 by cdb

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Would not one of those wind yourself Toroid transformer kits be up to
the job?



Colin
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2002\06\20@094913 by Chris Loiacono

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Doesn't sound like it would do since it would blow my UL, but I am
unfamiliar with these....
>
> Would not one of those wind yourself Toroid transformer kits be up to
> the job?
>
>
>
> Colin

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2002\06\20@125513 by David Minkler

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Chris,

Try ETS (Energy Transformation Systems) at http://www.etslan.com .  Ask
for Ben, he's made a number of customs for me in the past.

Regards,
Dave

Chris Loiacono wrote:
{Quote hidden}

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2002\06\20@134237 by Dwayne Reid

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At 08:57 AM 6/20/02 -0400, Chris Loiacono wrote:
>Does anyone have a source for custom PC mount transformers that they can
>share?
>I need to convert a 7805 based supply from a 230VAC line to 277V and 230V
>'standard' transformer primaries are only OK'd for use 10% above their rated
>voltage. I am hoping to be able to have a few specials wound, but I need a
>source.....anyone, please?

Where are you located, Chris?

We use ATC Frost <http://www.atc-frost.com> and Brownsburg Electronik Inc

I've had good results with both.

dwayne

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2002\06\20@191929 by Mike Singer

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>  Chris Loiacono wrote:
> >Does anyone have a source for custom PC mount transformers
> that they can
> >share?
> >I need to convert a 7805 based supply from a 230VAC line to
> 277V and 230V
> >'standard' transformer primaries are only OK'd for use 10%
> above their rated
> >voltage. I am hoping to be able to have a few specials
> wound, but I need a
> >source.....anyone, please?
>

  May be I'm missing something. Pick up transformer with extra
secondary 48v coil. Get this coil to primary. Hope isolation and
shielding will be OK.

  Good luck.
  Mike.

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2002\06\21@034041 by Morgan Olsson

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>I need to convert a 7805 based supply from a 230VAC line to 277V

Downconvert using a small additional transformer:


Use a small trafo specified as, say,  230V prim, 35V secondary

Connect the windings in serial, feed 277V across both windings, get 230V across the 230V winding.

You will be *feeding* the winding labeled "secondary", instead of loading it, so it´s voltage will be higher than specified for normal use, as this is a small trafo (high loss) it will be significantly higher, say 47V.

So, you feed it 230+47V=277V, and you take out 230V to your original tansformer across the 230V winding.

Note also that this downconvertng transformer can have a lot lower VA rating than the main transformer.  The output current is the originally specified current in each (prim and sec) windings *added*, then multiply by 230Volts and you get the new VA.

/Morgan

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2002\06\21@042245 by Pic Dude

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Haven't paid much attention to this thread (sorry), but
had saved this link for a rainy day, and thought it might
be useful to whoever asked...
http://members.tripod.com/~schematics/xform/xformer1.htm

Cheers,
-Neil.



{Original Message removed}

2002\06\21@071925 by Roman Black

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Chris Loiacono wrote:
>
> Does anyone have a source for custom PC mount transformers that they can
> share?
> I need to convert a 7805 based supply from a 230VAC line to 277V and 230V
> 'standard' transformer primaries are only OK'd for use 10% above their rated
> voltage. I am hoping to be able to have a few specials wound, but I need a
> source.....anyone, please?


(crazy idea following) :o)
If your output current is relatively constant you
can use a non-polarised capacitor in SERIES with
your transformer primary. Use a 630v Poly cap,
probably start with about 0.47uF and see how that
goes. The idea is that the cap drops *about* 45vac
(like a resistor would) but without dissipating any
real amount of heat. That way you can run your
230vac transformer from 277vac, and use a switch
to short the cap (voltage selector switch).
You should also use a resistor about 470k across
the cap, and one in series dropping about 10% of
what the cap does. These are needed for UL cert to
I think. Yeah it's a bit crazy, but cheap and
*probably* a solution for you?
:o)
-Roman

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2002\06\21@121033 by Dwayne Reid

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At 09:18 PM 6/21/02 +1000, Roman Black wrote:

>(crazy idea following) :o)
>If your output current is relatively constant you
>can use a non-polarised capacitor in SERIES with
>your transformer primary. Use a 630v Poly cap,
>probably start with about 0.47uF and see how that
>goes. The idea is that the cap drops *about* 45vac
>(like a resistor would) but without dissipating any
>real amount of heat.

This can work but you have to be REAL careful about avoiding
resonance.  For example, one of my neat tricks is to take a fan rated for
use at 230 Vac and operate it from 120 Vac by putting a capacitor in series
with the fan motor.  With the right sized capacitor, the fan motor sees
about 180 - 190 Vac.

dwayne


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Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 18 years of Engineering Innovation (1984 - 2002)
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