The scenario
Design a portable binaural microphone preamp with low noise and single-supply operation.
What is in this drawing
Read the decisions behind it.
01
Use OPA1656 dual FET-input op amp for low noise and low bias current
02
Bias electret capsules via 2.2 kΩ pull-ups to VCC
03
Set mid-rail bias with 100 kΩ divider and 10 µF filter
04
Gain 11 per channel with 10 kΩ/1 kΩ resistors
Portable battery-powered binaural recording, stereo microphone preamp, low-noise audio input stage.
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