Re: basics of transformer
- From: Jasen Betts <jasen@xxxxxxxxxxx>
- Date: Tue, 31 Jan 2006 09:03:20 -0000
On 2006-01-30, Abstract Dissonance <Abstract.Dissonance.hotmail.com> wrote:
>
> "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
No, the secpondary is 40 volts end-to end with a tap in the centre.
sometimes it's written 20-0-20
>> Also should I assume these are all RMS values?
yes
>> 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?
under load the voltage will "sag" down from 43V to about 40V
> 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
>
hopefully that 'G' is connected to the centre tap.
Bye.
Jasen
.
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