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From: "Phil Allison"
Subject: Re: Class B amplifiers: what are the large low-value resistors for?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Thu, 14 Nov 2002 18:31:33 +1100
NNTP-Posting-Date: Thu, 14 Nov 2002 18:21:40 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Bob" wrote in message
> The emitter resistors are there to:
> 1) Allow sensing of output-stage current
> 2) Provide some temperature stability for output-stage bias levels (in the
> case of class A or AB
> If you increase the value of these you will increase the open-loop output
> impedance of your amplifier. Not good for performance into reactive loads.
> You'll also lose more power from them.
** The bit about losing performance into reactive loads has me
worried - why do you say this Bob ?
Reactive loads have the characteristic of drawing higher current
from an amp around the zero crossing region than resistive ones.
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