[sdiy] Hammond Transformer Question

[Scott Gravenhorst]

"Romeo Fahl" <romeo.fahl at gmail.com> wrote:
>Hi,
>
>I talked a friend into buying a Hammond transformer, without having
>tried on myself. I've got the datasheet, which you'll find here:
>http://www.hammondmfg.com/pdf/185Insert.pdf but I'm not clear on how
>to wire up the output.
>What I need is for it to take 120 VAC in and output 36 VAC with a
>Center Tap, so it can then be connected to a +/-15 V power supply
>board. The input part is easy, since that's clearly depicted in the
>datasheet. What I'm not sure about is how to wire up the output pins
>to get the desired Center Tap. Do I use the series or parallel
>diagram? Which pin is used for the center tap? Possibly worth noting
>is that each side of the xformer has a fifth middle pin that's not
>listed in the diagram. Perhaps this is the CT pin? Any help is
>appreciated!
>

The bottom of the PDF shows what you need.

See "Secondary Connections - 185 Series Transformers", on the right is shown the
hookup for 36 volts with CT.  The center tap will be the junction of tabs 8 and
11.  The left diagram shows how to get 18 volts (no center tap) with double the
output current.


-- ScottG
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-- Scott Gravenhorst
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