by Eeyore <rabbitsfriendsandrelations@[EMAIL PROTECTED]
>
Apr 22, 2008 at 02:52 PM
Iain Churches wrote:
> "Eeyore" <rabbitsfriendsandrelations@[EMAIL PROTECTED]
> wrote
> > Iain Churches wrote:
> >
> >> The standard 6V3 winding would give 8.8V DC.
> >
> > Not with rectifier voltage drops it won't. More like 6.8V.
>
> I did not include the rectifier losses.
>
> The AC is at about 235V here this afternoon. I have a
> Welter mains transformer on the bench in front
> of me. The heater winding is 6.3V at 3A reg 5%. With
> a BR156 rectifier and 10 000µF and drawing 3A I measure
> 7.6V across the electrolytic.
With how much ripple ?
Drawing 3A DC from a winding designed for 3A AC is likely to burn it out
btw.
> What does a SS regulator require?
If you use a 'low dropout' type you may need as little as 0.5V of
'overhead'.
Graham
