Preamp for LR Baggs M1

[JRay]

Hi All
I am putting together a belt preamp for a new Takamine Triax pickup (LR Baggs M1 essentially) for my acoustic. This pickup has an output of around 100mV maximum and therefore I need a little over 20dB of gain. I also want a volume control and low output impedance. I have put together the circuit below based on a OPA2134 op-amp (a little over kill for this app, but I need the headroom and very low noise)



I wondered if you could advise if it would be better to configure the input op-amp as unity gain and use the op-amp after the volume pot to provide all the gain, or as shown, share the gain between both op-amp sections? I am thinking that if the input op-amp had less output, this may lower any pot noise when adjusting the volume?

Also do you guys and girls think the component values I have in the feedback loops etc will result in good low noise and good fidelity operation?

Any improvement suggestions are very welcome!

Cheers
Ray

[petemoore]

  An opamp data sheet and related comprehension references can explain opamp gain better than my typing.
   Consider the opamp buffer configuration as 1:1 unity gain [though it may turn out to be very slightly <1:1 gain, the current drive might make it seem boosted].
  I'd use the volume pot../ or toss it and put an alternative to "pot=volume control" into service there if the potentiometer bugged me for some reason.