From: John Woodgate
Subject: Re: Amplifying stage with negative Vgain??
Date: Wed, 4 Dec 2002 19:12:02 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Wed, 4 Dec 2002 21:06:44 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Paul Burridge
wrote (in ) about 'Amplifying stage with negative Vgain??', on Wed, 4
>On Wed, 4 Dec 2002 10:28:14 -0000, "Kevin Aylward"
> opined thusly:
>>What is your exact configuration, i.e. load impedance, source impedance,
>>operating current. Is this a sim or real life?
>I don't see impedance coming into it, quite honestly.
That's why you are in trouble. Arrogant answers to help will get you
flamed to hell, as you deserve.
>The input signal
>is still a healthy 8v directly on the base of the buffer device's
>transistor. On the emitter pin, however, it's just 2v.
>The circuit is a dead simple single stage C/C amp. R1 and R2 (both 3k)
>split 12v supply in half to bias the base of Q1 at 6v; there's no
>collector resistor (straight to Vcc) and RE is 1,080 ohms.
BC337 beta is typically 200, so your fbeta is ft/beta = 1.5 MHz,
possibly less. Choose another device for 3.57 MHz.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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