volume or gain control?

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bruin2k3
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Post by bruin2k3 »

Hi,
I'm going to be building a headphone splitter with individual volume or gain controls. I'm splitting the signal 8 ways, so obviously, I'll need some amps. I'll be using TL072 dual opamps. Now, my question is this...what's the best way to control volume?

1) Use dual gang pot to control signal upstream of the opamp
2) Use single gang pot to control the gain of the opamp
3) Use dual gang pot to control the output into my jacks

I assume option 1 would be bad because it would also affect the signal to the other headphones i'm splitting off. Option 2 would be easiest since I can use a single gang pot and eliminate one shop I need to buy from, but is Option 3 the best?

I'd be building something like this:
http://gilmore2.chem.northwestern.edu/p ... y2_prj.htm

Thanks!

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