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From: Paul Burridge
Subject: Re: Amplifying stage with *negative* Voltage gain??
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Date: Tue, 10 Dec 2002 11:29:00 +0000
NNTP-Posting-Date: Tue, 10 Dec 2002 12:57:22 GMT
Organization: Virgin Net Usenet Service
On Tue, 10 Dec 2002 12:20:07 +0000 (GMT), Tony Williams
> Which is still pointing to more load on the output
> 1nF than you have so far discovered. It could be a
> capacitance, or even something more absurd... any
> chance that the scope is stuck on 50-ohm input-R?
I've just checked on the scope input itself and it says "1M Ohm [in
parallel with] 30pf" earlier someone said it should be nearer 10M.,
but this is *definitely* just 1M (as opposed to the probe itself which
is higher - certainly on X10).
The only other source of capacitance would be two tracks of copper
2.5" long on the stripboard I've used to build this thing. They're
certainly in parallel with the 1n, but since we're only talking of the
low megahertz here, I wouldn't have thought that would be a problem.
"I was going to help him up, but then I thumped him."
Michael Head's plea in mitigation to Weybridge Magistrates, Sept. 1975
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