DF player

I was wondering if anyone knows if there is a schematic for the DF player. I tried finding one online but could only see the pinout. DFPlayer Mini MP3 Player Module MP3 Module Voice with DAC and Amplifier for Arduino micro SD Card USB Disk IO/Serial Port/AD|Integrated Circuits| - AliExpress

https://wiki.dfrobot.com/DFPlayer_Mini_SKU_DFR0299#target_2