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Old 26th July 2008, 11:31 PM   #11
lineup is offline lineup  Sweden
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LM317/337 is better.
They have better performance in quality. A bit at least.

Besides, they have adjustable voltage. ( 1.25 - 30 Volt via resistors )
While 7812/7912 have only one fixed 12 Volt output.

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Old 28th July 2008, 10:23 PM   #12
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Since the transformer that Jim Hagerman uses in his design is out of stock at Digikey:

http://parts.digikey.com/1/parts/100...dal-70023.html

is this a suitable alternative?

Aside from the 1A higher max output, it looks the same to me.

http://search.digikey.com/scripts/Dk...me=595-1333-ND

or this one?

http://search.digikey.com/scripts/Dk...me=595-1219-ND
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Old 29th July 2008, 06:23 PM   #13
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I actually prefer Signal's transformers over the Amveco's.
I have a preference for split bobbin over toroid, but
that would be a whole different thread going into
philosophy!
I'd say either one would be fine and may even prefer
the 14V paralell sec. (28V series sec. which is how you'll
want to wire it anyway).
Absolutely nothing wrong with extra current capability
and many (myself included) find sonic benefit in a beefier
supply. I'd even splurge myself and go for at least double
that current rating, but remember your goal is economy.
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Old 29th July 2008, 09:20 PM   #14
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For a few bucks more, I ordered one of these:

http://search.digikey.com/scripts/Dk...me=595-1026-ND
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Old 29th July 2008, 11:10 PM   #15
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Excellent if you do PC mount? Are you making your own boards?
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Old 30th July 2008, 03:04 AM   #16
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I wasn't planning on it actually. I looked at some of the chassis mount transformers, but they're all MUCH higher current than I need. I was thinking that I'd hot glue the one I ordered in place inside the box that I'll be using for the transformer and the preamp, and then solder the connections to the preamp board and to the chassis mounted AC input jack.
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Old 30th July 2008, 11:22 PM   #17
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That'll work!
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Old 31st July 2008, 12:19 AM   #18
lineup is offline lineup  Sweden
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Quote:
Originally posted by JWFokker

I was thinking that I'd hot glue the one I ordered in place inside the box
that I'll be using for the transformer and the preamp,
and then solder the connections to the preamp board
and to the chassis mounted AC input jack.
Something like this way of mine, maybe.

It is from one small Class A Power amp (my own design)
with separate Trafo+Regulator for input/voltage amp
and Unregulated Bigger transformer for Power Output stage.

The bigger is glued to the bottom of the board.
The one to the right is using mechanical attachment
I did fix smaller trafo using plastic package strips and 2 screws.
As shown.
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Old 5th August 2008, 01:35 AM   #19
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Well, I've got the transformer and now I realize that I'm not exactly certain how to wire it. I've never used a dual output transformer before and I'm terrible at reading schematics.

Based on this image from the datasheet PDF, it looks like I should have the 115VAC going to pins 1 and 4, and the neutral going to 3 and 6? And then 7 and 10 should end up 14VAC and 9 and 12 will be neutral/ground?

Click the image to open in full size.
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Old 5th August 2008, 07:47 PM   #20
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You are correct about the primary (115V) side. On the secondary
side power one side of your rectifier assembly by pin 7 the other
side of the bridge by pin 12. Tie 9 and 10 together and make
and use this as your ground ref. Instead of the wire coming
off the middle leg of the secondary on the attachment your
jumper between pin 9 and pin 10 form that middle leg.
Hope this attachment works.
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