Hi,
I have a couple nice 25K Noble pots and would like to use them for a headphone amp/DAC output (DDDAC1543 with 16 DAC chips). The problem is that the attenuation of those pots is far too aggressive for what I need. No matter how I wire them, it's almost an on/off situation. I think a 2k attenuator would be more appropriate for what I need.
Can I just add a resistor in parallel with the attenuator to reduce it's range, or would that mess up the pots logarhythmic curve?
Peter
I have a couple nice 25K Noble pots and would like to use them for a headphone amp/DAC output (DDDAC1543 with 16 DAC chips). The problem is that the attenuation of those pots is far too aggressive for what I need. No matter how I wire them, it's almost an on/off situation. I think a 2k attenuator would be more appropriate for what I need.
Can I just add a resistor in parallel with the attenuator to reduce it's range, or would that mess up the pots logarhythmic curve?
Peter
i dont see how a different value pot will attenuate less or more.
sounds to me like you wired your pot wrong. A properly wired pot functions as a voltage divider. What determines attenuation is ratio between the two parts of the resistor (separated by the wiper). So if you have a 2k pot or a 1Meg pot, the attenuation will be the same!
check that you have not wired your pot backwards as an anti-log pot. This would mean that instead of voltage input slowly increasing in a logarithmic fashion, it would go the other way, increase very fast than slowly producing an almost on/off behaviour when used as a volume control.
sounds to me like you wired your pot wrong. A properly wired pot functions as a voltage divider. What determines attenuation is ratio between the two parts of the resistor (separated by the wiper). So if you have a 2k pot or a 1Meg pot, the attenuation will be the same!
check that you have not wired your pot backwards as an anti-log pot. This would mean that instead of voltage input slowly increasing in a logarithmic fashion, it would go the other way, increase very fast than slowly producing an almost on/off behaviour when used as a volume control.
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