3886 chipamp: POT or switched atten for volume ctrl?

albireo13 · 21st June 2010, 04:01 PM

Is there an advantage of either one over the other for this?

Thx,
Rob

AndrewT · 21st June 2010, 04:35 PM

a well made switched pot has much closer matching of channels than a pair of tracks inside a dual pot.
The switched pot may be more reliable and certainly easier to keep clean.
The switched pot is generally more expensive and sometimes as much as 200times more.
The switched pot would need a much stronger motor if you decided to go for motor adjustment.

albireo13 · 21st June 2010, 04:57 PM

Thx. Don't need motor ctrl. One concern I have with switched POTs is that the make-break of contacts, as you rotate knob, could cause pops and clicks in the audio. Anyone see (hear) this happen?

abraxalito · 21st June 2010, 05:00 PM

Quote:

Originally Posted by albireo13

Anyone see (hear) this happen?

I built one with reed relays, it certainly did happen. I believe you can get make before break switches which will certainly help but not totally eliminate clicks.

AndrewT · 21st June 2010, 05:06 PM

if you ensure that there is no DC voltage across the switch then make before break should lead to silent switching.
How often do you adjust volume, once per track, once per hour, once per listening session?

21st June 2010, 04:01 PM	#1
albireo13 diyAudio Member Join Date: Feb 2010	3886 chipamp: POT or switched atten for volume ctrl? Is there an advantage of either one over the other for this? Thx, Rob

21st June 2010, 04:35 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	a well made switched pot has much closer matching of channels than a pair of tracks inside a dual pot. The switched pot may be more reliable and certainly easier to keep clean. The switched pot is generally more expensive and sometimes as much as 200times more. The switched pot would need a much stronger motor if you decided to go for motor adjustment. __________________ regards Andrew T.

21st June 2010, 05:06 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	if you ensure that there is no DC voltage across the switch then make before break should lead to silent switching. How often do you adjust volume, once per track, once per hour, once per listening session? __________________ regards Andrew T.

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21st June 2010, 04:57 PM	#3
albireo13 diyAudio Member Join Date: Feb 2010	Thx. Don't need motor ctrl. One concern I have with switched POTs is that the make-break of contacts, as you rotate knob, could cause pops and clicks in the audio. Anyone see (hear) this happen?

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