Biasing LM3875 (NIGC) into class A

Dr.H · 2nd November 2004, 09:58 AM

Hi,

Has anyone tried to bias the LM3875 into class A using a resistor or JFET's. If so, what values were used?

carlosfm · 3rd November 2004, 08:59 PM

Quote:

Originally posted by Dr.H
Hi,
Has anyone tried to bias the LM3875 into class A using a resistor or JFET's. If so, what values were used?

I remember an old schematic flowing around with a 1.5K resistor from V- to output.
Someone has tested it and reported it was no good.
Doesn't surprize me, as with +/- 30V PSU this is 20ma, too low.

2nd November 2004, 09:58 AM	#1
Dr.H diyAudio Member Join Date: Apr 2002	Biasing LM3875 (NIGC) into class A Hi, Has anyone tried to bias the LM3875 into class A using a resistor or JFET's. If so, what values were used?

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