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Old 10th July 2012, 06:22 AM   #1
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Default Volume pot for line level stereo

I looked and searched but could not find a clear answer.

I need to control the volume of a stereo iPod input before my amplifier.

I want a good quality volume pot I can mount in my project box. If it was weather resistant that would be a bonus.

Any suggestions?

Mike
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Old 10th July 2012, 04:41 PM   #2
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Be careful !
I tried this going from my soundcard to active speakers
I bought a 10K Alps pot but it hasn't worked,the volume is still the same
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Old 10th July 2012, 05:09 PM   #3
Mooly is online now Mooly  United Kingdom
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You need a dual gang (stereo) pot. The value isn't critical but somewhere in the 10K to 47K range is ideal. A "log" type is normally used for volume controls but either log or linear will work just fine.

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Quote:
Originally Posted by titch View Post
Be careful !
I tried this going from my soundcard to active speakers
I bought a 10K Alps pot but it hasn't worked,the volume is still the same
Sounds as though you haven't wired it correctly.

Potentiometer Connection Help

And posts #45 and #46 here,
Simple stereo gain stage
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Old 10th July 2012, 05:41 PM   #4
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Thanks for your help
I hadn't connected the "other! legs of the pot to earth.
Job for tomorrow
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Old 10th July 2012, 06:19 PM   #5
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Mooly,

Can you give me a model number and where to buy one? There are just so many options :-)

Thanks!!

Mike


Quote:
Originally Posted by Mooly View Post
You need a dual gang (stereo) pot. The value isn't critical but somewhere in the 10K to 47K range is ideal. A "log" type is normally used for volume controls but either log or linear will work just fine.

-------------------------------------------------------------------------------------------



Sounds as though you haven't wired it correctly.

Potentiometer Connection Help

And posts #45 and #46 here,
Simple stereo gain stage
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Old 11th July 2012, 06:43 AM   #7
Mooly is online now Mooly  United Kingdom
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That comes up as unavailable for me but it's the right kind of part. ALPS generally considered one of the best but it might be overkill for what you need.

Don't know what kind of outlets you have in your locality but any component retailer should have suitable parts and they needn't be expensive. Check out Mouser and Digikey in the US for all parts you'll ever need.

PC2G16ECO10KB - OMEG - POT, DUAL GANG, LOG, 10K | CPC

Here's a 22K "traditional" style. The connections are the same on any pot.
OW2G20BU22KB - OMEG - POT, DUAL GANG, LOG, 22K | CPC

2 x 10K OHM Logarithmic Dual Rotary Taper Potentiometer A10K 10KA POT ALPHA | eBay

You might be interested in this. Read the bit on potentiometer tapers and changing the law of a pot.

Potentiometers (Beginners' Guide to Pots)
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Old 16th September 2012, 07:39 PM   #8
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So I got the 10k Alps and there is no bass unless you are at almost full on the. I read somewhere else that the impedance of the pot to too high for my source. So should I buy a 5k pot?

Why is this so hard to get a line level volume pot for a iphone signal?? I would think a lot of people need this but I cant find any info.

Thanks!!
Mike
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Old 16th September 2012, 07:56 PM   #9
AndrewT is offline AndrewT  Scotland
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You have not given us any data from which we could make estimates of what you have done wrong.

The volume pot behaves as a load on your source. While it does that duty there will be some form of filter created.

The volume pot behaves as a source for your next stage (Power amplifier, or Buffer or, ?) Again there is the possibility of a filter being created.

You need to tell us what the initial Source output parameters are and the final load input parameters.
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Old 16th September 2012, 08:10 PM   #10
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Why dont you use the volume control on the ipod ?
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