Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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RE: OHMS LAW.....

Posted by jea48 (A) on July 13, 2012 at 17:38:44

In Reply to: RE: OHMS LAW..... posted by ecir38 on July 13, 2012 at 15:30:15:

with a resistive load wouldn't the amount of resistance needed change if you were to try different taps.

Looking at the Signal xfmr chart in the provided link below the manufacture gives the FLA, (Full Load Amps), for series and paralleled secondary windings. Those given in the charts should technically be used.

Note the SU-2 FLA max are half that of the DU-2 max FLA.
The voltage ratings for the primary windings and secondary windings are exactly twice that of the DU-2.

If the SU-2 is fed from by the same lower voltage as the DU-2 is the FLA max readings the same? Don't know...

Signal DU-2 xfmr.
Series secondaries 9 FLA max.
Parallel secondaries 18 FLA max.

I believe the FLA max for the DU-2 are for 120/240V (9 FLA) and single ended 120V (18 FLA) respectively.

The thing to remember is the wire size the manufacture used for the primary and secondary windings.

Is the SU-2 windings wire size smaller than the DU-2? Good question...
It could be. The chart says the FLA ratings are half that of the DU-2. You might want to check with the manufacture.

The whole reason for doing this was to find the best end voltage my equipment would see. I chose 208 and 110 being all the other configs put the voltage either higher or lower than I would be comfortable using.


You never mentioned what the actual mains voltage at the wall outlet is.... 120V? Less than 120V? More than 120V?

Your test chart shows the input voltage at 120V. I believe you said that voltage was a controlled voltage through a variac.

Your chart shows the unloaded output of the SU-2 at 125V unloaded.
125V could be a little high for a connected DAC or CDP if one or the other or even both are the only items powered up.
If the mains voltage at the wall recept is higher than 120V, then the 125V output of the xfmr will be higher.

• http://www.signaltransformer.com/sites/all/pdf/DU-SU.pdf   (Open in New Window)

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