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From: Paul Burridge
Subject: Re: Amplifying stage with *negative* Voltage gain??
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Date: Fri, 06 Dec 2002 08:40:19 +0000
NNTP-Posting-Date: Fri, 06 Dec 2002 10:08:48 GMT
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On Thu, 05 Dec 2002 09:10:32 -0500, Mike Monett opined
>Paul Burridge wrote:
>> > But I have a question. If you can drive the buffer with a solid 8V,
>> > the output impedance of the oscillator must be pretty low.
>> Indeed! But this was only cobbled together for test purposes. I'm
>> aware that a practical stage would be best designed for much lower
>> output for stability reasons.
>> Thanks again for your efforts.
>Thanks for the reply. Tony raised a good point - what's the attenuation
>of your scope probe?
It's rated up to 60MHz, Mike. And switchable for X1/X10.
>As far as a lower impedance driver, has you considered a complimentary
>NPN/PNP pair with the bases and emitters tied together? You can use John
>Larkin's trick of connecting a resistor between the bases and emitters to
>reduce the crossover distortion. I tried this - it really works well.
I don't doubt it, but right now I'm more concerned with trying to
establish why this circuit as built doesn't conform to expectations.
I'm determined to get to the bottom of it and with the assistance I've
had from your good self and others here I'm optimistic that I may
"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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