Volume control : - pot' or pot' variable feedback resistor (gain) ? - diyAudio
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Old 29th July 2006, 06:38 PM   #1
ash_dac is offline ash_dac  United Kingdom
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Default Volume control : - pot' or pot' variable feedback resistor (gain) ?

Hi,

I need to build a volume control.

Which is the common apporach use a pot' feeding a fixed gain amplifier or no pot with pot' variable feedback resistor (gain) ?

Also reliable brands for pot's ?

ALPS, Noble. any others ?

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Old 29th July 2006, 06:51 PM   #2
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You can do it either way. I've seen Music Fidelity (UK) use the two-wire variable resistor in a feedbak loop to adjust gain. I worry about changing the GBP or frequency response with gain setting. I personally, don't like that approach and would rather use a fixed gain stage feed a potentiometer and take the attenuated signal off of the wiper.

P.S. Spectrol makes good pots too. (pricey!)
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Old 30th July 2006, 01:59 AM   #3
Leolabs is offline Leolabs  Malaysia
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Or go for stepped attenuator,a little bit expensive but sounds great.
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Old 31st July 2006, 07:45 AM   #4
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Hey Ashley, build yourself one of these, you'll never go back to a mechanical pot again.

Lightspeed Attenuator a new passive preamp

Cheers George
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Old 1st August 2006, 01:03 AM   #5
Leolabs is offline Leolabs  Malaysia
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Quote:
Hey Ashley, build yourself one of these, you'll never go back to a mechanical pot again.
But can it beat the stepped attenuator in term of measurement(like distortion)???
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Old 1st August 2006, 05:07 AM   #6
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Quote:
Originally posted by Leolabs


But can it beat the stepped attenuator in term of measurement(like distortion)???
Your ears will tell you, yes, yes and yes

Leo read the whole thread, all 17 pages, the answer is there.

Cheers George
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