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Chip Amps Amplifiers based on integrated circuits

Lowest safe pot impedance?
Lowest safe pot impedance?
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Old 2nd January 2007, 05:20 PM   #1
Colescuttle is offline Colescuttle  United States
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Default 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
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Old 2nd January 2007, 05:59 PM   #2
analog_sa is offline analog_sa  Europe
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You can use 200ohms as far as the chip is concerned.
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Old 2nd January 2007, 07:06 PM   #3
CarlosT is offline CarlosT  United States
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Inverted or non-inverted design GC?
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Old 2nd January 2007, 07:12 PM   #4
Nordic is offline Nordic  South Africa
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you idealy would not do that with an inverted amp, as you would be adjusting the gain...
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Old 2nd January 2007, 07:33 PM   #5
Colescuttle is offline Colescuttle  United States
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Default Peter Daniel's NIGC.

Using Peter's RevC SE boards.
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