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Proper way to make balance potentiometer for audio
Proper way to make balance potentiometer for audio
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Old 16th October 2019, 04:13 PM   #11
Mark Johnson is offline Mark Johnson  United States
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Proper way to make balance potentiometer for audio
With two independent "channel balance" pots you have independent knobs and independent shafts. If you want, you can set the left one to 30% rotation and the right one to 55% rotation. You can't do that with a dual gang pot having a single knob and a single shaft.
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Old 16th October 2019, 04:15 PM   #12
merlin el mago is offline merlin el mago  Europe
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Ah, now I understand but I can't see the advantatge. Can be more simple two mono volume pots.

Last edited by merlin el mago; 16th October 2019 at 04:21 PM.
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Old 16th October 2019, 04:44 PM   #13
stocktrader200 is offline stocktrader200  Canada
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stereo ( better ) or mono linear 500k pot. center to ground ends to L and R
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Old 17th October 2019, 03:50 AM   #14
sangram is offline sangram  India
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Quote:
Originally Posted by merlin el mago View Post
Ah, now I understand but I can't see the advantatge. Can be more simple two mono volume pots.
You'll never manage exact match unless it's two stepped attenuators.

There are preamps like that, FWIW.
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Old 17th October 2019, 10:00 AM   #15
merlin el mago is offline merlin el mago  Europe
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Quote:
Originally Posted by stocktrader200 View Post
stereo ( better ) or mono linear 500k pot. center to ground ends to L and R
Why 500K, could you elaborate how do you get the proper value?
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Old 17th October 2019, 02:10 PM   #16
Mark Johnson is offline Mark Johnson  United States
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Proper way to make balance potentiometer for audio
The First Watt B1 with Korg Triode includes two separate, single-gang potentiometers for gain adjustment. One pot for the Left channel and another pot for the Right. Link to review including photos.

A diyaudio member inquired, "When you have dual mono pots without any clicks to ensure same setting of both pots, then you have to do the "tracking" by "eye and/or ear"?"

And Nelson Pass answered, "I would have thought, but I find that separately dialing them up makes you more aware of the balance. It doesn't bother me at all. Perhaps Mark Levinson's preamp had something....."

(Here is a link to his post.)

I've attached an image of the Mark Levinson preamp which I (MJ) think Nelson Pass is talking about. It has two balance pots and a volume pot.

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Last edited by Mark Johnson; 17th October 2019 at 02:12 PM.
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Old 17th October 2019, 03:02 PM   #17
merlin el mago is offline merlin el mago  Europe
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Some schematics & formulae to get the appropiate values for pots & values of resistor if needed.
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Old 17th October 2019, 05:25 PM   #18
Mark Johnson is offline Mark Johnson  United States
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Proper way to make balance potentiometer for audio
Have a look at Douglas Self's book "Small Signal Audio Design". The 2nd edition has two full chapters about this (ch. 13 & 14), with large numbers of tables, graphs, formulae, and discussion. The publisher's website (Focal Press) has the book's Table Of Contents online and viewable; I took a screen capture image of one page, attached below.

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Old 17th October 2019, 10:16 PM   #19
PRR is online now PRR  United States
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Originally Posted by Mark Johnson View Post
Have a look at Douglas Self's book "Small Signal Audio Design"....
+1 While not exhaustive, or "trendy", Self's SSAD is for-sure your First Stop for volume/balance networks.
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