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From: Paul Burridge
Subject: Re: Amplifying stage with *negative* Voltage gain??
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Date: Thu, 12 Dec 2002 13:51:10 +0000
NNTP-Posting-Date: Thu, 12 Dec 2002 15:19:31 GMT
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On Thu, 12 Dec 2002 13:22:41 +0000 (GMT), Tony Williams
> Isn't that just the scope probe loading affecting the
> low-impedance output less than the input?
Brilliant! I do hope you're right as I'd really like to lay this thing
to rest. What I will take away from this is the knowledge that you
can't make a measurement without affecting the quantities you're
trying to measure. Until now I'd only assumed it was a marginal effect
that one only had to take into account with (for example) extremely
high impedance sources.
> I'm beginning to suspect Paul that it is all working
> ok..... until poking a (x1) scope probe on the input
> buggerates the oscillator.
I'm strongly tempted to agree with you for the peace of mind aspect
> At this stage you've done so many exhaustive checks
> that you can pretty well believe that the ac signal
> on the emitter is a fairly good 1:1 representation
> of what is being delivered to the base.
Excellent. Let's hope no one comes along with less satisfactory but
more plausible explanation. :-)
"What is now proved was once only imagin'd"
- William Blake, 1793
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