[sdiy] basic transformer question

[Florian Anwander]

Eehhhm, what about connecting red and brown and then you should measure

green <-21V-> red/brown <- 21V -> blue
green <---------42V-------------> blue

Florian

Derek Holzer schrieb:
> 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
> 
>