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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.
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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.