Remove Volume Pot on Tripath Amp

vcmarshall · 25th August 2011, 08:00 PM

Hi folks,
So I have a Tripath amp board with a volume pot on it. But the board isn't in use ever it's just set to max volume inside the case. I thought I might remove it since I could use it somewhere else. Can I just take the pot out, and put a jumper across the in and out pin holes to complete the signal path again, and leave the earth pin hole? That should be the same in terms of signal attenuation going into the amp right, ie none?

sofaspud · 25th August 2011, 08:22 PM

yes

vcmarshall · 25th August 2011, 09:54 PM

Thanks. Thought I might as well check...

! · 28th August 2011, 04:21 AM

Not exactly, you'd be leaving out the pot's pull down to ground (what you're calling the "earth pin hole"). You can remedy that by putting same value resistor (suppose pot is 50K, use 50K resistor... pot value should be stamped on the back or side of it) between input and ground.

vcmarshall · 28th August 2011, 09:11 AM

Why do I need to put a fixed resistor in parallel with the amplifier? That's just the same as having the volume pot at max volume. It functions ok just with jumpers...

Esperado · 28th August 2011, 11:45 AM

Quote:

Originally Posted by vcmarshall

Why do I need to put a fixed resistor in parallel with the amplifier? That's just the same as having the volume pot at max volume. It functions ok just with jumpers...

Because if your amp input need to be referenced to the ground (condenser or reference for the input), it will need this. Removing the pot has only one advantage is better contact for noise.

! · 29th August 2011, 09:18 PM

Quote:

Originally Posted by vcmarshall

Why do I need to put a fixed resistor in parallel with the amplifier? That's just the same as having the volume pot at max volume. It functions ok just with jumpers...

By lowering input impedance you reduce RF noise picked up. Maybe in your particular configuration you can't hear any. Good... but it doesn't necessarily mean you never will.

! · 29th August 2011, 10:33 PM

Ignore what I wrote, I see on the schematic it "supposedly" has a 10K resistor between input and ground on both L/R channels already.

25th August 2011, 08:00 PM	#1
vcmarshall diyAudio Member Join Date: Apr 2010	Remove Volume Pot on Tripath Amp Hi folks, So I have a Tripath amp board with a volume pot on it. But the board isn't in use ever it's just set to max volume inside the case. I thought I might remove it since I could use it somewhere else. Can I just take the pot out, and put a jumper across the in and out pin holes to complete the signal path again, and leave the earth pin hole? That should be the same in terms of signal attenuation going into the amp right, ie none?

25th August 2011, 08:22 PM	#2
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio TX	yes __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

25th August 2011, 09:54 PM	#3
vcmarshall diyAudio Member Join Date: Apr 2010	Thanks Thanks. Thought I might as well check...

28th August 2011, 09:11 AM	#5
vcmarshall diyAudio Member Join Date: Apr 2010	Need for pull down resistor? Why do I need to put a fixed resistor in parallel with the amplifier? That's just the same as having the volume pot at max volume. It functions ok just with jumpers...

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28th August 2011, 04:21 AM	#4
! diyAudio Member Join Date: Jun 2005 Location: Midwest	Not exactly, you'd be leaving out the pot's pull down to ground (what you're calling the "earth pin hole"). You can remedy that by putting same value resistor (suppose pot is 50K, use 50K resistor... pot value should be stamped on the back or side of it) between input and ground.

29th August 2011, 10:33 PM	#8
! diyAudio Member Join Date: Jun 2005 Location: Midwest	Ignore what I wrote, I see on the schematic it "supposedly" has a 10K resistor between input and ground on both L/R channels already.

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