The LM3886 used this time is an AB class power amplifier IC which has a reputation for sound quality and can find various examples on the internet. ※ If you do not make your own, you can buy a completed substrate at around 3000 yen to 5000 yen 【BGM】 Alan Walker - Fade [NCS Release] - Lights by Sappheiros Creative Commons — Attribution 3.0 Unported — CC BY 3.0 Music promoted by Audio Library Song: "Peritune - Sakuya2" is under a Creative Commons license (CC-BY) Music promoted by BreakingCopyright: Happy Life by FREDJI Music promoted by Audio Library