From: ian field on

"sparc" <sparc_001(a)yahoo.com> wrote in message
news:1155236394.382644.151200(a)i3g2000cwc.googlegroups.com...
> 2N3055s ...and AD149s ... all Si too ...
>

All Pro-Electron numbered devices beginning with "A" are Germanium!


From: Mark Fortune on
David wrote:
>
> "Mark Fortune" <mark(a)fortrex.co.uk> wrote in message
> news:44db929f$0$31649$db0fefd9(a)news.zen.co.uk...
>
>> sparc wrote:
>>
>>> u know ...if u really wish to "learn" ...why dont you design yourself a
>>> 50A, 0-50V continuously variable SMPS ....capable of operating in both
>>> CV and CC modes.
>>>

--------------8<---------------8<--------------------

>> So yes, forgive me for my sins, I repent! ;)
>>
>> Thanks to all those that offered their advice however, it's been
>> insightful to me, and I certainly wont give up the opportunity to
>> build my own transformers in future... just not on such a power crazed
>> level where there are better solutions.
>>
>> Regards,
>> Mark
>
>
> Also realize 50A at 50V is 2500 watts at 100% efficiency. If you are in
> the USA, you will need a 220V power connection to do this.
>
> David
>

Wow, pretty sure i'm not going to need 50A at any voltage... not sure
where that came from as originally I only wanted 10A. Incidently though,
im in the UK so we have 230V by default.
From: isw on
In article <lxMCg.3554$%j7.860(a)newssvr29.news.prodigy.net>,
"David" <someone(a)some-where.com> wrote:

> "Mark Fortune" <mark(a)fortrex.co.uk> wrote in message
> news:44db929f$0$31649$db0fefd9(a)news.zen.co.uk...
> > sparc wrote:
> >> u know ...if u really wish to "learn" ...why dont you design yourself a
> >> 50A, 0-50V continuously variable SMPS ....capable of operating in both
> >> CV and CC modes.
> >>
> >> (i know what some ppl are going to say ....he wants to learn ...not
> >> repent)
> >>
> >
> > Given the replies i've had on this, it seems the more sensible way of
> > going about it. Whilst i'm sure I will enjoy with experimenting with
> > transformers in the future, building a power transformer - specifically
> > the beast i'm after does seem to be costly and time consuming going by the
> > responses i've had on this thread, and is unlikely to work (first time
> > around anyway), where in contrast I could just pick up old/broken
> > equipment at the local car boot sale for under a fiver. I've had a little
> > read on (very basic concepts of) switching mode power supplies, and this
> > does seem to way to go in terms of efficiency and size.
> >
> > So yes, forgive me for my sins, I repent! ;)
> >
> > Thanks to all those that offered their advice however, it's been
> > insightful to me, and I certainly wont give up the opportunity to build my
> > own transformers in future... just not on such a power crazed level where
> > there are better solutions.
> >
> > Regards,
> > Mark
>
> Also realize 50A at 50V is 2500 watts at 100% efficiency. If you are in the
> USA, you will need a 220V power connection to do this.

Not to mention the heatsinks it'll take when you want to deliver, say,
12 volts at anywhere near that 50 Amps. Hint: Plan on a fan and wheels.

Isaac
From: Dave Plowman (News) on
In article <44db929f$0$31649$db0fefd9(a)news.zen.co.uk>,
Mark Fortune <mark(a)fortrex.co.uk> wrote:
> Thanks to all those that offered their advice however, it's been
> insightful to me, and I certainly wont give up the opportunity to build
> my own transformers in future... just not on such a power crazed level
> where there are better solutions.

I'd also query the need for such a large bench top supply - unless you're
regularly repairing or building things like power amps.

--
*The man who fell into an upholstery machine is fully recovered*

Dave Plowman dave(a)davenoise.co.uk London SW
To e-mail, change noise into sound.
From: Mark Fortune on
Dave Plowman (News) wrote:
> In article <44db929f$0$31649$db0fefd9(a)news.zen.co.uk>,
> Mark Fortune <mark(a)fortrex.co.uk> wrote:
>
>>Thanks to all those that offered their advice however, it's been
>>insightful to me, and I certainly wont give up the opportunity to build
>>my own transformers in future... just not on such a power crazed level
>>where there are better solutions.
>
>
> I'd also query the need for such a large bench top supply - unless you're
> regularly repairing or building things like power amps.
>

aha, you've discovered one of my planned future hobbies :)
any money in it though?
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