The MJ802G MJ802 802 is a 100V 30A 200W transistor, Use for as an output device in complementary audio amplifiers to 100−Watts music power per channel.
These epitaxial planar transistors are mounted in the TO-126 plastic package. The NPN types are the BD135 and BD139, and the complementary PNP types are the BD136 and BD140.
The PL2303HX is a USB to UART TTL (Transistor-Transistor Logic) converter module that allows communication between a computer or other USB-equipped device and a UART device through a USB port.