DIY micro tower (desktop version)

TL;DR

• A DIY micro tower combines a radio, spectrum visualizer, and amplifier in two compact desktop enclosures.
• The radio uses ESP32S3, a 2.8-inch IPS display, MPR121 touch sensing behind 4 mm tinted glass, and encoder-based station browsing.
• The units measure 200x61x130 mm for the radio and 200x40x130 mm for the spectrum and amplifier sections.
• The spectrum runs on an ESP32 using both cores, refreshing two 1.9-inch IPS displays at 37 to 41 FPS.
• The amplifier is not hi-fi, uses a TPA3110 module and AVT kit 2132 tone control, and the station list is stored rigidly in firmware.