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From: John Woodgate
Subject: Re: Amplifying stage with negative Vgain??
Date: Thu, 5 Dec 2002 17:39:21 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Thu, 5 Dec 2002 20:43:09 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Fred Bloggs
wrote (in <3DEF7AA3.firstname.lastname@example.org>) about 'Amplifying stage with
negative Vgain??', on Thu, 5 Dec 2002:
>If the BC337 pinout is such that you have connected E to the input
>junction of the 3k's, B to 12V, and C to the 1080 output resistor, then
>you end up with a configuration that gets 2Vp-p across that 1080 for
>8Vp-p at the input. You have almost certainly done something like this.
>You can figure this out if you measure the quiescent DC voltages at the
> three nodes- what are they?
A sort of nommoc-esab stage! I suspect there are at least two sorts of
BC337 about (as with other TO-92s of that vintage). It should be e-b-c,
but some may be e-c-b and some may be e-c-b but with the leads pre-
formed to e-b-c on a TO-5 circle. Getting one of those that has had the
leads straightened can be just a bit confusing!
My book says there was also a Ferranti (Zetex) BC337P which was c-b-e!
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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