Re: 12V Electronic Tranny


Phil Allison wrote:
> <bill.sloman@xxxxxxxx>
> >
> >> ** The output transformer is made with two ferrite E cores - so most of
> >> it is in free air.
> >>
> >> As stated - the temp rise with 100VA load is not more than 10 degrees
> >> C.
> >
> > The temperature rise at the surface of the transformer maybe 10C under
> > the conditions of your test. The heat is being dissipated inside the
> > coil and inside the ferrite. For the heat to flow to the surface, there
> > has to be a temperature gradient in the ferrite and in the coil. Copper
> > is a pretty good thermal conductor, so you don't get much of a thermal
> > gradient in the coil. The ferrite is a better insulator - nowhere near
> > as good as air, but lots better than copper.
>
>
> ** What a load of **fucking** gobbledegook !!!!!!!

If I haven't dumbed down the message enough already, you need to post
your questions on sci.electronics.basics.

> The core is TINY !!

What is tiny in millimetres (or inches - I happen to understand both).

> There is SFA temp gradient .

Not a recognised egineering unit. You seem to want to think that it is
negligible, but until you've done the minimal amount of work needed to
work out what it might b, you are just an optimisitc idiot. Had you
asked nicely, I might have taken the time to do some of the work for
you.

> > You'd need to drill an angled hole into the ferrite under the coil to
> > get closer to the temperature rise where it matters.
>
>
> ** Is this ranting fuckwit on drugs ?

Sure - a beta-blocker, and ACE-inhibitor, a statin and a trivial dose
of some diuretic, which my little brother suspects of synergy with the
ACE-inhibitor.

> Or has he forgotten to take them ????

Obviously not, or my blood pressure would have gone through the roof
while reading this twaddle.

> > You also need to worry about the degradation in the performance of the
> > ferrite with increasing temperature. It completely stops being
> > ferromagnetic at the Curie point, but it isn't up to much when it gets
> > close to that sort of temperature.
>
>
> ** Sure - at 150 C maybe.

Depends on the ferrite. Some are good 450C, some fall over at 100C.

> Not 50C.

How would you know?

> Piss of slow man.

Your abuse is at the same infantile level as your electronics. Go and
read some Richard Steven Waltz, and see if you can raise your game to
merely despicable.

--
Bill Sloman, Nijmegen

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