Attenuation and Vol control alternatives...

MikeF777 · 17th December 2003, 08:57 PM

It seems that the preferred method for varying the volume of amps is to attenuate the incoming signal. Is it also acceptable
to vary the gain of the chip amp using a pot as one of the gain set resistors? Is this really only applicable to chip amps since there is essentially only one gain stage? Any theories/ experimental data on whether or not this method is better or worse?

Thanks,

Mike

Cobra2 · 17th December 2003, 10:06 PM

The Hi-Fi police will charge you with contemt for the importance of feedback-resistor quality.
And I'm sure they also will come up with more...

Arne K

GregGC · 17th December 2003, 10:30 PM

First: Correct me if I’m wrong, but I red somewhere that the optimum gain for Power amp is between 22 and 30 (or something like that, 30dB).

Second: How can you get it down to mute if you use the feedback resistor as a volume control? The lowest it’ll go is gain of 1.

Hybrid fourdoor · 18th December 2003, 07:10 AM

I asked this exact question once, got some various answers. I thought it would be good, because the input impedence would always be the same, and at low volumes you would be lowering the gain, thus overall distortion.

Anyways have a read

My original thread

17th December 2003, 08:57 PM	#1
MikeF777 diyAudio Member Join Date: Dec 2003 Location: Cleveland	Attenuation and Vol control alternatives... It seems that the preferred method for varying the volume of amps is to attenuate the incoming signal. Is it also acceptable to vary the gain of the chip amp using a pot as one of the gain set resistors? Is this really only applicable to chip amps since there is essentially only one gain stage? Any theories/ experimental data on whether or not this method is better or worse? Thanks, Mike

17th December 2003, 10:06 PM	#2
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	The Hi-Fi police will charge you with contemt for the importance of feedback-resistor quality. And I'm sure they also will come up with more... Arne K __________________ Ars longa, vita brevis

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17th December 2003, 10:30 PM	#3
GregGC diyAudio Member Join Date: Oct 2003 Location: Toronto	First: Correct me if I’m wrong, but I red somewhere that the optimum gain for Power amp is between 22 and 30 (or something like that, 30dB). Second: How can you get it down to mute if you use the feedback resistor as a volume control? The lowest it’ll go is gain of 1.

18th December 2003, 07:10 AM	#4
Hybrid fourdoor diyAudio Member Join Date: May 2003 Location: Ft. Worth, TX	I asked this exact question once, got some various answers. I thought it would be good, because the input impedence would always be the same, and at low volumes you would be lowering the gain, thus overall distortion. Anyways have a read My original thread

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