Lowest safe pot impedance?

Colescuttle · 2nd January 2007, 05:20 PM

What's the lowest value pot impedance one can safely use with a LM3875 if one eliminates the series input resistor (R1)? Would 20K be marginal?

Other values:

R3 = 680R
RNFB = 22K
R2 = 22K

analog_sa · 2nd January 2007, 05:59 PM

You can use 200ohms as far as the chip is concerned.

CarlosT · 2nd January 2007, 07:06 PM

Inverted or non-inverted design GC?

Nordic · 2nd January 2007, 07:12 PM

you idealy would not do that with an inverted amp, as you would be adjusting the gain...

Colescuttle · 2nd January 2007, 07:33 PM

Using Peter's RevC SE boards.

2nd January 2007, 05:20 PM	#1
Colescuttle diyAudio Member Join Date: Sep 2006	Lowest safe pot impedance? What's the lowest value pot impedance one can safely use with a LM3875 if one eliminates the series input resistor (R1)? Would 20K be marginal? Other values: R3 = 680R RNFB = 22K R2 = 22K

2nd January 2007, 07:33 PM	#5
Colescuttle diyAudio Member Join Date: Sep 2006	Peter Daniel's NIGC. Using Peter's RevC SE boards.

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2nd January 2007, 05:59 PM	#2
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	You can use 200ohms as far as the chip is concerned.

2nd January 2007, 07:06 PM	#3
CarlosT diyAudio Member Join Date: Oct 2006	Inverted or non-inverted design GC?

2nd January 2007, 07:12 PM	#4
Nordic diyAudio Member Join Date: Sep 2005	you idealy would not do that with an inverted amp, as you would be adjusting the gain...

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