Fixing Analog Audio on a $2.58 HDMI-to-VGA Adapter

Fixing analog audio on the $2.58 HDMI-to-VGA adapter

I bought a cheap HDMI-to-VGA adapter to connect my Nintendo Switch to a CRT, but the audio output was filled with terrible noise. After diagnosing ground loops and ultrasonic interference from the delta-sigma DAC, I spent days prototyping filters and reworking the PCB. By identifying the NX3303X chip and modifying the hardware, I finally achieved clean audio from this budget device.

"I will never buy a new Nintendo console after they sued Switch emulator developers, abusing their corporate legal budget to threaten independent developers with personal ruin over legally protected activity to pad their corporate coffers."