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STM32G4 USB Spectrum Sound Card

Overview

Enough with the chit-chat, let's start with some pictures!

It uses an STM32G431CBU6 as the main controller, a CS4398 as the DAC, and an NJM386 as the power amplifier. The power amplifier section uses a modular design with independent plug-ins, increasing component density.
The CS4398 is the DAC used in the Vivo X5Pro phone (at the time, Vivo was still emphasizing HiFi), and the NJM386 is the power amplifier used in the legendary Sony WMD6C.
After connecting to the computer via USB, the screen displays the spectrum in real time; two LED ceramic filaments are also included for decoration.
Feel free to leave any questions in the Bilibili video comment section, as I don't log into the LCSC platform frequently and might miss some information.

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-26 16:38:41

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