Show HN: Building Electret Mic Preamp Open sourced

5 nativeforks 2 6/11/2025, 9:35:43 AM hackaday.io ↗

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!

Comments (2)

atmanactive · 1d ago

Impressive! Good work. I love it that you made it open source, and that makes me want to buy it even more. How can I buy a fully assembled product from you and make a donation in the process?

nativeforks · 1d ago

I've made the process easy for others to mimic this. But I don't have a budget to make CUSTOM PCB's and sell it. Thanks for your appreciation :)

Show HN: Tritium – The Legal IDE in Rust (tritium.legal)

Show HN: Tool-Assisted Speedrunning the Boring Parts of Animal Crossing (GCN) (github.com)

Show HN: Vim-like text editor in go. (LSP, TreeSitter, Themes) (github.com)

Show HN: I rebuilt the recruitment process from the ground up (chronoflow.ai)

Show HN: Spark, An advanced 3D Gaussian Splatting renderer for Three.js (sparkjs.dev)

Show HN: ChatToSTL – AI text-to-CAD for 3D printing (huggingface.co)

Show HN: Eyesite – Experimental website combining computer vision and web design (blog.andykhau.com)

Show HN: RomM – An open-source, self-hosted ROM manager and player (github.com)

Show HN: DIY virtual HDMI monitor using "AR" glasses (github.com)

Show HN: Open sourcing my developer portfolio (github.com)

Show HN: Ikuyo a Travel Planning Web Application (ikuyo.kenrick95.org)

Show HN: S3mini – Tiny and fast S3-compatible client, no-deps, edge-ready (github.com)

Show HN: A “Course” as an MCP Server (mastra.ai)

Show HN: I made a 3D printed VTOL drone (tsungxu.com)

Show HN: High End Color Quantizer (github.com)

Show HN: Most users won't report bugs unless you make it stupidly easy

Show HN: The Roman Industrial Revolution that could have been (thelydianstone.com)

Show HN: Interactive Enigma Machine Simulator (enigmasimulator.com)

Show HN: Chili3d – A open-source, browser-based 3D CAD application

Show HN: I built an app to calculate body type and generate AI fitness plans (mybodytype.net)

Show HN: PyDoll – Async Python scraping engine with native CAPTCHA bypass (github.com)

Show HN: Apple's new "Liquid Glass" effect as a Svelte component (npmjs.com)

Show HN: MidWord – A Word-Guessing Game (midword.com)

Show HN: Munal OS: a graphical experimental OS with WASM sandboxing (github.com)

Show HN: Let’s Bend – Open-Source Harmonica Bending Trainer (letsbend.de)

Show HN: An open-source rhythm dungeon crawler in 16 x 9 pixels (github.com)

Show HN:I made a word translation plugin for language learning.

Show HN: Glowstick – type level tensor shapes in stable rust (github.com)

Show HN: AuraCoder – Gen AI Learning Platform (auracoder.com)

Show HN: Somo – a human friendly alternative to netstat (github.com)

Show HN: I created an AI search engine for the Quebec Civil Code (codex-nuvia.ca)

Show HN: Update to my meta glasses API "Hey Meta send a message to ChatGPT" (github.com)

Show HN: I am making an app to rival "Everything" (drimiteros.github.io)

Show HN: I'm 13 and I built an AI PDF Reader (github.com)

Show HN: Rapidez – Headless Magento with Laravel and InstantSearch (rapidez.io)

Show HN: Turn your YT videos into AI-tutor (youtube.com)

Show HN: A MCP server and client implementing the latest spec (github.com)

Show HN: StopX – AI-powered content blocker with 99.7% (stopx.today)

Show HN: UserWatch – AI product analyst. Instant dashbords, AB tests, AI replays (userwatch.xyz)

Show HN: I built a tool to use my homelab apps remotely without a full VPN (github.com)

Show HN: CongressMCP – interact with congress.gov data in natural language (github.com)

Show HN: I built a photo-to-checklist app to help with cleaning paralysis (tidylist.app)

Show HN: I made CSS-only glitch effect (muffinman.io)

Show HN: Ask-human-mcp – zero-config human-in-loop hatch to stop hallucinations (masonyarbrough.com)

Show HN: Operations manager agent for remote team work (get.traction.team)

Show HN: Jomon – a network forensics and passive sniffer tool (github.com)

Show HN: Open-source Go Challenges – Interactive practice for interviews (github.com)

Show HN: I built a loadout building and sharing tool for Helldivers 2 (helldivehelper.net)

Show HN: I'm building an app to replace Overleaf and Notion

Show HN: AI game animation sprite generator (godmodeai.cloud)

Show HN: Building Electret Mic Preamp Open sourced

Comments (2)