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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, 03:37 PM   #1
merlin el mago is offline merlin el mago  Europe
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Default Proper way to make balance potentiometer for audio

I wanna advice how to make the proper way to do a balance potentiometer for audio.

I'm using 100K ladder resistor as volume control but also I use AVC.

TIA
Felipe
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Old 16th October 2019, 03:53 PM   #2
sangram is offline sangram  India
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The ideal way? Buffer the volume control signal and use a dedicated half-and-half balance control, or make your own by using half the steps of a ladder attenuator.

Otherwise the hacked single pot with two series resistors works well enough for 99% of users. Buffering is critical for good response of passive attenuators.
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Old 16th October 2019, 03:54 PM   #3
merlin el mago is offline merlin el mago  Europe
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I use active preamp. Could you post a schematic or link? How can calculate the resistors values?
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Old 16th October 2019, 03:57 PM   #4
rayma is offline rayma  United States
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Quote:
Originally Posted by merlin el mago View Post
I use active preamp. Could you post a schematic or link? How can calculate the resistors values?
Depends on how much balance trim you want.
https://i.stack.imgur.com/6kL0c.png
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Old 16th October 2019, 04:00 PM   #5
merlin el mago is offline merlin el mago  Europe
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Thanks Rayma how do you calculate the 30K resistors? The 100K pot is lin or log? It's OK always 100K pot or depends the value of volume pot? Where to install: I guess before the volume pot right?
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Old 16th October 2019, 04:03 PM   #6
rayma is offline rayma  United States
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Originally Posted by merlin el mago View Post
Thanks Rayma how do you calculate the 30K resistors? The 100K pot is lin or log? It's OK always 100K pot or depends the value of volume pot? Where to install: I guess before the volume pot right?
Just before the volume control. This circuit is for a linear balance pot.
Post your schematic and this will be easier, since the values depend on your circuit.

Last edited by rayma; 16th October 2019 at 04:06 PM.
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Old 16th October 2019, 04:05 PM   #7
merlin el mago is offline merlin el mago  Europe
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That's I want to know: how to calculate depend the circuit?

My case I have only two options: 100K ladder resistor attenuator & AVC (autoformer volume control)

Input always low impedance.

Your schematic seem always have attenuation the 30K resistors in series?
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Old 16th October 2019, 04:06 PM   #8
BesPav is offline BesPav  Russian Federation
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Originally Posted by merlin el mago View Post
proper way

Put a differential receiver in the front, pick unbalanced signal from it and regulate it under unbalanced manner as you wish, put a fully-differential amplifier as the last unbal->bal stage.
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Old 16th October 2019, 04:07 PM   #9
Mark Johnson is offline Mark Johnson  United States
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Proper way to make balance potentiometer for audio
Why not copy the idea Nelson Pass used in his "Threshold NS10" design: use two potentiometers for balance and one more for volume? See image below.


_
Attached Images
File Type: jpg ns10.jpg (233.6 KB, 172 views)
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Old 16th October 2019, 04:09 PM   #10
merlin el mago is offline merlin el mago  Europe
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That's no matter dual gang or two pots.
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