Show HN: Building Electret Mic Preamp Open sourced

I designed and built a studio-quality electret microphone preamp focused on low noise, high gain, and clean audio capture using easily available components.

This is an original design — it does not follow TI, Analog Devices, or other common application schematics.

The circuit was tested and verified in LTspice before building. All schematics, design rationale, and build instructions are open-sourced for anyone to replicate or improve.

Here's a short demo of the audio performance: https://youtu.be/RZR_PrxcBBU?si=9gN_5yx09bwNFjba

I spent over a month researching, simulating, and testing before publishing. Feedback is welcome!