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Old 18th August 2007, 11:33 PM   #1
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Default Help with phase/polarity of transformer

Could someone point out how to wire this transformer for 115V primary, 36V secondary with a center tap? I need +18V, GND, and -18V. The pinout info is at the bottom of page 2.

http://www.advancedcomponents.com/st...df/SSPF043.PDF

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Old 19th August 2007, 06:21 AM   #2
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Go for the 2x18 V secondary and wire like this;
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File Type: jpg jakebrown transformer.jpg (16.4 KB, 245 views)
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Old 19th August 2007, 04:37 PM   #3
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From the data sheet, you seem to have the primary right (3+5 live, 1+7 neutral) but not the secondary since they show a series connection as 12-16 connected (center), 9 / 13 outputs.

jake - you understand that the DC voltage will be 1.4 x AC voltage (full wave rectification, C-input filter) minus diode drops, right? A 2 x 18V AC transformer will get you about +/- 24V DC.
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Old 19th August 2007, 04:56 PM   #4
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Thats right..
I just assumed you needed +/-18V (AC)
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Old 19th August 2007, 07:18 PM   #5
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Yes I needed +/- 18V AC for this circuit: http://www.freeinfosociety.com/elect...iew.php?id=119 .
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Old 20th August 2007, 04:36 AM   #6
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Fine
Then just go on as I've showed you in post 2
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Old 20th August 2007, 04:38 AM   #7
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Great, thank you very much.

-Jake
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Old 20th August 2007, 04:45 AM   #8
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Old 22nd August 2007, 10:18 AM   #9
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What I'm saying is that the way I read the data sheet, if you follow ACD's schematic, the outputs will be in phase and that is presumably not what you wanted.
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Old 22nd August 2007, 10:23 AM   #10
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wine&dine;
You are right... I just made a quick schem and didn't notised the connection of the primary windings
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