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Thread: Passive Volume Knob!!!!

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    Passive Volume Knob!!!!

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    So I want to build a simple stereo volume knob similar to the one listed here

    http://ca.geocities.com/dkleined@rog...enuatorBox.htm

    Bow If I want to use 1/4" in and outs can I just wire the pot to the connectors with wire without using any resistors? Would that work?

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    Yes. The resistors are just added to keep the level from going down to zero.

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    Quote Originally Posted by mshilarious View Post
    Yes. The resistors are just added to keep the level from going down to zero.
    Do you know of a pot that would be able to run both channels with 1 knob?
    The article says to use a 10k log pot is there anything else that would be better?

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    Quote Originally Posted by ObiAudio.com View Post
    Do you know of a pot that would be able to run both channels with 1 knob?
    The article says to use a 10k log pot is there anything else that would be better?
    Yes, use a dual pot. You want a log taper for volume, but as for the value it depends on your application. 10K is just right for line-level, but too low for a guitar and too high for a speaker. Also, this pad will have variable (and thus potentially high) output impedance, so ideally you want it on the downstream side of the signal chain.

    You can do a constant-impedance control with two pots per channel; that's a dual pot for mono and a quad pot (very hard to find) for stereo. But unless that is important, I wouldn't worry about it.

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    Quote Originally Posted by mshilarious View Post
    Yes, use a dual pot. You want a log taper for volume, but as for the value it depends on your application. 10K is just right for line-level, but too low for a guitar and too high for a speaker. Also, this pad will have variable (and thus potentially high) output impedance, so ideally you want it on the downstream side of the signal chain.

    You can do a constant-impedance control with two pots per channel; that's a dual pot for mono and a quad pot (very hard to find) for stereo. But unless that is important, I wouldn't worry about it.
    Ok dont want to sound redundant....
    10k long pot
    I want a quad for stereo or dual for 2 mono
    and I can wire this directly from and to the 1/4" jacks with nothing else needed.

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    Quote Originally Posted by ObiAudio.com View Post
    Ok dont want to sound redundant....
    10k long pot
    I want a quad for stereo or dual for 2 mono
    and I can wire this directly from and to the 1/4" jacks with nothing else needed.
    No, dual for stereo, unless you have a special case. A speaker attenuator would be a good example. If this is a line-level volume control, it's not necessary in most circumstances.

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    Quote Originally Posted by mshilarious View Post
    No, dual for stereo, unless you have a special case. A speaker attenuator would be a good example. If this is a line-level volume control, it's not necessary in most circumstances.
    Ok so a dual is for stereo? Should which would you use? 2 Pots for right and left channel or 1 dual pot? And yes this is a line level signal. It is to control the levels of my powered monitors from my echo layla which has no hardware attenuator or volume besides a headphones out.

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    Quote Originally Posted by ObiAudio.com View Post
    Ok so a dual is for stereo? Should which would you use? 2 Pots for right and left channel or 1 dual pot? And yes this is a line level signal. It is to control the levels of my powered monitors from my echo layla which has no hardware attenuator or volume besides a headphones out.
    Separate pots for stereo gets annoying. Besides, you want to calibrate your monitors and leave them. I would go dual pot, but what I actually do for myself is set -14dBFS RMS = 85dBSPL and use my software fader. Yes, that means I am sacrificing dynamic range due to D/A converter noise, but it doesn't matter since that noise lives at -13dBSPL.

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