Show HN: Electret Mic Preamp Circuit

I built a studio-quality electret mic preamp that’s all about low noise, high gain, and super clean audio — and the best part? It uses easy-to-find components. This is my own design, not based on the usual TI or Analog Devices reference circuits. I ran tons of simulations in LTspice before actually building it, just to make sure everything checked out.

Everything’s open-source — schematics, design notes, and step-by-step build guide — so feel free to copy it, tweak it, or make it better.

Here's a quick demo of how it sounds: https://youtu.be/RZR_PrxcBBU?si=9gN_5yx09bwNFjba

I spent over a month diving into research, testing, and fine-tuning. Would love to hear what you think!