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Is setting an alps volume pot to the full position the same as bypassing?
Is setting an alps volume pot to the full position the same as bypassing?
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Old 11th February 2009, 10:49 PM   #1
boidos is offline boidos  Australia
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Default Is setting an alps volume pot to the full position the same as bypassing?

Hi All,
I am looking to use some shunt stepped attenuators with my class d amps.
Is setting its alps volume pot to the full position effectively the same as bypassing it? Or should I be removing it for maximum quality sound?

thanks!
Boyd
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Old 11th February 2009, 11:10 PM   #2
Ed Holland is offline Ed Holland  England
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Not quite exactly the same, but it should be good enough for most practical purposes. Try it first.

The long answer:
The pot, set to maximum, will present a load equal to its maximum resistance value to the source of any signal. At the simplest analysis, this will still result in a small attenuation, dependant upon the impedance of that source. Since the alps pot is probably 10's or maybe 100's of kOhm, and the source impedance is likely 100's of Ohms, the attenuation is negligable - after all the input impedance of the next stage may well be comparable to or less than the pot's resistance.

Of course there is always some parasitic capacitance added by the pot, but this is not something I'd worry about.

Cheers,

Ed
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Old 12th February 2009, 03:16 PM   #3
Xoc1 is offline Xoc1  United Kingdom
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If you can bipass the volume control you should.
The wiring which typically snakes around the amp introduces a certain amount of hum and noise.
The Pot becomes a pull down resistor. Typically this has a very poor temperature coefficient. 500ppm is not unusual for some carbon types!
This is exactly what you are trying to avoid by using a stepped attenuator.
Also some pots are very microphonic.
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Old 12th February 2009, 08:57 PM   #4
boidos is offline boidos  Australia
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Default Removing the volume pot

Hi, thanks for the reply. Any tips on the easiest way to remove the volume pot.?
Cheers
Boyd
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