[sdiy] basic transformer question

[Derek Holzer]

Hi folks,

I have a 1x230V/2x18V/30VA ring transformer, and my power supply board 
calls for a center-tapped 36V trafo.  The board I'm working with is CGS 
66 PSU:

http://www.cgs.synth.net/modules/cgs66_psu.html

The color code of secondaries is as follows:

--------green
|
|
--------red
--------brown
|
|
--------blue

The transformer isn't really behaving as predicted. I expected that 
Green-Blue would give 36VAC or higher, however this is what I get:

Green-Red: 21V
Green-Brown: 0V
Green-Blue: 0V

Blue-Brown: 21V
Blue-Red: 0v
Blue-Green: 0V

Red-Brown: 0V

So my assumption is that Green and Blue might be out of phase, since 
adding them together gives 0V instead of 36 or higher....

Is this still usable, if I wire Red & Brown to GND, Green & Blue to 18 
VAC? Am I missing something simple here? Thanks in advance for reading 
this admittedly n00b question, it's only that I don't want to blow 
anything up!!!

Thx+best!
Derek


-- 
derek holzer ::: http://www.umatic.nl ::: http://blog.myspace.com/macumbista
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