On Mar 17, 4:21=A0am, flipper <flip...@[EMAIL PROTECTED]
> wrote:
> On Mon, 17 Mar 2008 07:19:59 +1100, "Trevor Wilson"
>
>
>
> <trevor@[EMAIL PROTECTED]
> wrote:
>
> >"Patrick Turner" <i...@[EMAIL PROTECTED]
> wrote in message
> >news:47DD0B84.E12FE8B9@[EMAIL PROTECTED]
>
> ><SNIP>
>
> >> More about noise and its causes is in RDH4, and because j-fets were
not=
> >> invented in 1953
> >> when RDH4 was being written, I suggest interested ppl search on the
net=
> >> and read many books to put themselves
> >> in touch with what makes a quiet preamp.
>
> >**Thanks for all that, Patrick. As always, very interesting. Just a
minor=
> >nit-pick though. FETs have actually been around for a long time. A very
l=
ong
> >time.
>
> Lilienfeld's FET is not a jFET.
>
> > Here's a few patent references:
>
>
>http://v3.espacenet.com/origdoc?DB=3DEPODOC&IDX=3DUS1745175&RPN=3DCA27243=
7&...
>
> >http://v3.espacenet.com/textdoc?DB=3DEPODOC&IDX=3DGB439457
>
> >Of course, neither device was commercially available. Imagine if people
h=
ad
> >paid attention to this technology back in the 1930s.
>
> There was the not entirely trivial problem of being unable to make
> them.
>
> As the story goes, Shockley was unsuccessfully trying to make a field
> effect device (FET) like Lilienfeld's and, in investigating the
> problem, Bardeen and Brattain stumbled upon the point-contact bipolar
> transistor.
>
> You have a similar 'theory' vs 'make it' problem with lasers, the
> basic theory stemming from Einstein in 1917 but it took till 1960 for
> the first ruby laser to work. And Gabor developed the theory of
> holography in 1948, over a decade before there was a laser to make one
> with.
>
> > Having said all that,
> >practical FETs did not arrive until around 1958. Long after RDH4 was
> >written.
>
> >Trevor Wilson
The interesting thing is the visible acceleration between conception
and practical execution. -- Andre Jute
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