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From: Tony Williams
Subject: Re: Class B amplifiers: what are the large low-value resistors for?
Date: Sun, 17 Nov 2002 10:18:32 +0000 (GMT)
NNTP-Posting-Date: Sun, 17 Nov 2002 10:56:29 +0000 (UTC)
User-Agent: Pluto/1.14i (RISC-OS/3.60)
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.
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