In modifiying an Opamp audio circuit, for the volume control, there are a few ways to go about it.
1. Potentiometer before the gain stage (noise is amplified)
2. Potentiometer after the gain stage
3. A low impedance Pot generating Variable Gain but not in the negative feedback loop.
I'm looking at options 2 and 3.
My preference for option 3 is that rather than having the gain being constant and attenuate the gained signal of option 2, we are able to have low gain (and its benefits at low volume levels) and only get more noise etc when increasing the gain past unity.
The concept is this: The feedback loop has a fixed resistance, but the division to ground is varied. Thus the feedback loop is not dirtied.
What are your thoughts on this?
1. Potentiometer before the gain stage (noise is amplified)
2. Potentiometer after the gain stage
3. A low impedance Pot generating Variable Gain but not in the negative feedback loop.
I'm looking at options 2 and 3.
My preference for option 3 is that rather than having the gain being constant and attenuate the gained signal of option 2, we are able to have low gain (and its benefits at low volume levels) and only get more noise etc when increasing the gain past unity.
The concept is this: The feedback loop has a fixed resistance, but the division to ground is varied. Thus the feedback loop is not dirtied.
What are your thoughts on this?
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