The scenario
A compact phantom-powered binaural microphone preamp needs to boost low-level condenser mic signals while keeping noise low and offering switchable gain for different recording levels.
What is in this drawing
Read the decisions behind it.
01
Use OPA2134 dual op-amp for low noise and dual-channel binaural operation.
02
Provide 48V phantom power through 6.8k resistors to each electret mic capsule.
03
Switchable gain via SPST switches engaging a 100Ω resistor in parallel with the 1kΩ feedback shunt.
Reusable for portable battery-powered binaural recording rigs, head-worn microphone arrays, or stereo ambience capture where low noise and adjustable preamp gain are required.
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