An USB isolator assists do away with ground loops and lowers electromagnetic interference (EMI) concerning the computer plus the connected system. 1x GND 3V3 (P2 with two pins 2.54mm) connector may be used to ability externally the WCH CH569 MCU (it is recommended to get rid of the P4/SHUNT in https://charlesx840xws5.blog-a-story.com/profile