Stereo volume control

Adam M. · 26th February 2004, 01:45 AM

How do you implement a stereo volume control with only one volume dial? I could not find any schematics or explinations I could make sense of.
Thanks,
Adam

ronc · 26th February 2004, 02:01 AM

Dual pot.But most of the time you have to add a resistor to make them equal.
ron

Hybrid fourdoor · 26th February 2004, 02:09 AM

You could use a Maxim DS1802 Digital Pot. You can do a simple pushbutton (up / down) configuration that requires no special hardware.

Heres a link to their PDF about how to build one....quite easy looking.

Or you can use a single gang potentiometer to drive a digital pot. The circuit tracks the analog pot and sends a digital signal to the digital pot. Thus giving you the resolution and channel acuracy of a digital pot, with the feel of a analog pot. Heres the link

Hybrid fourdoor · 26th February 2004, 02:11 AM

As far as using a resistor on a dual pot, I'm assuming you mean adding a resistor to one pot to offset the difference? The only problem I see with that is that at minimum and maximum positions, they will be off by whatever the resistor is. But who spends time at min or max anyways!?

Unless you mean in parallel or something?

ronc · 26th February 2004, 04:09 AM

Yep, thats why i use 2 pots.I have yet to find a truly equal dual pot.
ron

ChemMan · 26th February 2004, 04:19 AM

How about a dual gang volume pot followed by a dual gang balance pot?

ronc · 26th February 2004, 04:18 PM

Or just 2 pots which is a combo volume/balance?
I find that as i sit in various positions positions in the room i have to adjust to different levels (channel volume postions) to get a balanced sound, but i am using narrow beam (8") FR pipes.So the sweet spot is a bit smaller than multi ways.
ron

till · 26th February 2004, 04:21 PM

or use a PGA2310

Ouroboros · 26th February 2004, 04:57 PM

Quote:

Originally posted by Hybrid fourdoor
Or you can use a single gang potentiometer to drive a digital pot. The circuit tracks the analog pot and sends a digital signal to the digital pot. Thus giving you the resolution and channel acuracy of a digital pot, with the feel of a analog pot. Heres the link

Also very useful to produce multi-gang pots to go on the output of Behringer 2496 active crossovers!

Hybrid fourdoor · 27th February 2004, 02:54 AM

So can you use a digital pot with an active crossover circuit, that way you have very high resolution and consistant selections?

Using the pot as the resistor in the active crossover circuit? That would be cool, becuase then one knob could control an <infinite> amount of channels to all be at the same level.

26th February 2004, 01:45 AM	#1
Adam M. diyAudio Member Join Date: Feb 2004 Location: Pittsburgh	Stereo volume control How do you implement a stereo volume control with only one volume dial? I could not find any schematics or explinations I could make sense of. Thanks, Adam

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26th February 2004, 02:01 AM	#2
ronc diyAudio Member Join Date: Mar 2003	Dual pot.But most of the time you have to add a resistor to make them equal. ron

26th February 2004, 02:09 AM	#3
Hybrid fourdoor diyAudio Member Join Date: May 2003 Location: Ft. Worth, TX	You could use a Maxim DS1802 Digital Pot. You can do a simple pushbutton (up / down) configuration that requires no special hardware. Heres a link to their PDF about how to build one....quite easy looking. Or you can use a single gang potentiometer to drive a digital pot. The circuit tracks the analog pot and sends a digital signal to the digital pot. Thus giving you the resolution and channel acuracy of a digital pot, with the feel of a analog pot. Heres the link

26th February 2004, 02:11 AM	#4
Hybrid fourdoor diyAudio Member Join Date: May 2003 Location: Ft. Worth, TX	As far as using a resistor on a dual pot, I'm assuming you mean adding a resistor to one pot to offset the difference? The only problem I see with that is that at minimum and maximum positions, they will be off by whatever the resistor is. But who spends time at min or max anyways!? Unless you mean in parallel or something?

26th February 2004, 04:09 AM	#5
ronc diyAudio Member Join Date: Mar 2003	Yep, thats why i use 2 pots.I have yet to find a truly equal dual pot. ron

26th February 2004, 04:19 AM	#6
ChemMan diyAudio Member Join Date: Dec 2003 Location: New Jersey	How about a dual gang volume pot followed by a dual gang balance pot?

26th February 2004, 04:18 PM	#7
ronc diyAudio Member Join Date: Mar 2003	Or just 2 pots which is a combo volume/balance? I find that as i sit in various positions positions in the room i have to adjust to different levels (channel volume postions) to get a balanced sound, but i am using narrow beam (8") FR pipes.So the sweet spot is a bit smaller than multi ways. ron

26th February 2004, 04:21 PM	#8
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	or use a PGA2310

27th February 2004, 02:54 AM	#10
Hybrid fourdoor diyAudio Member Join Date: May 2003 Location: Ft. Worth, TX	So can you use a digital pot with an active crossover circuit, that way you have very high resolution and consistant selections? Using the pot as the resistor in the active crossover circuit? That would be cool, becuase then one knob could control an <infinite> amount of channels to all be at the same level.

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