https://ariunbold.dev/en https://ariunbold.dev/hero.webp Ariunbold Bold — Hero Portrait Ariunbold Bold, systems developer from Mongolia. https://ariunbold.dev/en/work/esp32 https://ariunbold.dev/esp32-poster.webp ESP32 OLED Animation — Project Poster ESP32 microcontroller driving a 128×64 OLED with animated GIF frames. https://ariunbold.dev/en/work/cryocell https://ariunbold.dev/mobile-poster.webp Samsung Galaxy S21 CryoCell Mod — Project Poster Custom 10,000mAh battery and active cooling mod for the Galaxy S21. https://ariunbold.dev/en/work/bt-speaker https://ariunbold.dev/ble_speaker_final_poster.webp Custom DIY Bluetooth Speaker — Project Poster Custom-built portable stereo Bluetooth speaker with dual power rails. https://ariunbold.dev/en/about https://ariunbold.dev/tsetseg.webp Tsetseg — Flower Photo A flower photograph taken by Ariunbold Bold. https://ariunbold.dev/en/work/pusda-speaker https://ariunbold.dev/pusda_speaker.webp Pusda Speaker— Build Photo Second-generation DIY Bluetooth stereo speaker using XH-MX8 amplifier, MH-MX8 BT receiver, and dual isolated power rails. Enclosure is the amp's original shipping box.