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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: Sun, 17 Nov 2002 23:59:07 +1100
NNTP-Posting-Date: Sun, 17 Nov 2002 23:48:57 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Tony Williams" wrote in message
> In article ,
> Phil Allison wrote:
> > ** The LM 324 can deliver and sink plenty of current
> > ( 10mA or more) when operated from a single supply as long
> > as the output swings not closer than one volt to the supply
> > or ground.
> Put a pull-down resistor (or current sink) so that the
> output stage of the 324 is biassed into Class A.
> > I expect a pair of AC127 /128 connected as followers
> > work very nicely as they are direct coupled to the IC and
> > likely bias themselves due to leakage current.
> Put a 1k resistor between bases and emitters, so
> that the (Class A) opamp can supply the load current
> whilst the transistors are crossing-over.
** Tony, go and read the Natsemi data for the LM324. It recommends the
use of complementary boost transistors.
It warns against cap coupling on grounds of x-over dist.
If you know the two Ge transistor follower idea does *not* work then
post the info.
Otherwise what are you on about ????
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