Potentiometer for TPA3110 AMP

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For volume control one needs a logarithmic potentiometer, not a linear one. When using a linear one operation is frustrating. What value is depending on what the gain factor is of your board. TPA chips have varying impedance. They are highest impedance when 20 dB mode is chosen. Please check. datasheet. They are 60 kOhm in 20 dB mode and only 9 kOhm in 36 dB mode ( in which they hiss and are way too sensitive as a bonus).

In 20 dB mode a 50 kOhm stereo logarithmic potentiometer will work OK (if you use 2 channels). There are cheap stepped attenuators on Ebay that work fine and have better properties than potentiometers.
 
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#4
jean-paul said:
For volume control one needs a logarithmic potentiometer, not a linear one. When using a linear one operation is frustrating. What value is depending on what the gain factor is of your board. TPA chips have varying impedance. They are highest impedance when 20 dB mode is chosen. Please check. datasheet. They are 60 kOhm in 20 dB mode and only 9 kOhm in 36 dB mode ( in which they hiss and are way too sensitive as a bonus).

In 20 dB mode a 50 kOhm stereo logarithmic potentiometer will work OK (if you use 2 channels). There are cheap stepped attenuators on Ebay that work fine and have better properties than potentiometers.
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I have 2 amps, the Sure mono TPA3110, and the Sanwu. The Sure is 26db gain, but I can't seem to find that for the Sanwu.

I need a pot with a rotary switch, so I'm looking at either a CTS or a Bourns pro audio, I'm just unsure of the resistance. I did know that I need an audio/log taper.

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