상황
A portable stereo recorder needs two matched low-noise channels for binaural electret capsules powered from a compact 9V battery pack.
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01
Use BF862 JFETs for low gate-leakage noise and simple self-biasing.
02
AC-couple microphone signals and outputs to isolate DC bias and prevent clicks.
03
Add local supply decoupling with 100 uF to keep both channels stable.
Reusable as a portable binaural microphone front-end for field recording, ASMR, or nature sound capture where low noise and battery operation matter.