Re: basics of transformer


"Abstract Dissonance" <Abstract.Dissonance.hotmail.com> wrote in message
news:11tsugte9qp1ka8@xxxxxxxxxxxxxxxxxxxxx
>I have a 40VCT .25A transformer and I'm wondering what those numbers mean..
>
> does the 40VCT mean 40VAC from the center tap? If so across its full
> secondary its 80VAC? and the .25A means that it can handle at most .25A
> across its secondary coil(since its a step down from 120VAC the max
> current in its primary should be smaller... ~80/120*.25?).
>
> Also should I assume these are all RMS values? When I put my variac up to
> 100VAC and hook it up to my transformer I get about 40 volts across the
> hole secondary(hence 20V's across from the center tap). But this means
> that at the mains(117VAC?) I'll be getting more than 40VAC across the full
> secondary? Is this ok to have the transformer have a little more than its
> voltage rating?
>

Oh, at at those settings(40VAC across full secondary) the output off my caps
is ~30VDC "half way" and ~60VDC full (I'm using a split bridge so I can
supply 2).

something like

V+ -+- V1o
|
---+
---
|
+---G
|
---+
---
|
V- -+- V2o



Thanks,
Jon



.

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