Fixing analog audio on the $2.58 HDMI-to-VGA adapter
zdw
12 points
8 comments
July 05, 2026
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Discussion Highlights (3 comments)
andrewstuart
>> A photo revealed the chip was a NX3303X; I could not find any datasheets Not much information out there but these are similar chips, possibly it’s a clone? Capstone CS5213 datasheet: https://file.elecfans.com/web2/M00/2B/BD/pYYBAGHVUbyARd_-AAU... And also the AlgolTek AG6200 / AG6201 Series, datasheet: https://assets.yoreparo.com/attachments/28SGHqLW2Z2MfSzEBJB4...
andrewstuart
These chips appear to be 8051s with multi hundred MHz DACs. Be fun to program them but I can’t find any programmable devboards with the Capstone CS5213.
olelele
What kind of mixer do you use? If it has balanced xlr inputs a DI will completely eliminate the earth hum. That the signal is dropped to mic level doesn’t matter much as the impedance is correct, the connection balanced and the mixer preamp designed for the purpose. // I am somewhat professional sound tech :)