Bugs,
On your schematic I can see the way that you have implemented selectable gain control of the 1st stage. Have you encountered any problems with either a large reduction in slew rate, phase distortion or lag, any other undesirable traits in the feedback response of the front end amplifier?
I make mention of this as i tested a similar design some years ago and found problems with the feedback path. Do you have any scope shots of the input and output to compare?
On your schematic I can see the way that you have implemented selectable gain control of the 1st stage. Have you encountered any problems with either a large reduction in slew rate, phase distortion or lag, any other undesirable traits in the feedback response of the front end amplifier?
I make mention of this as i tested a similar design some years ago and found problems with the feedback path. Do you have any scope shots of the input and output to compare?
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