这是我为国外设计的电能表（圆表）完整的电路图和PCB，已经交付国外，运行性能能良好，欢迎交流。-This is my design for the foreign power meter (round table) a complete schematic and PCB, have been delivered abroad, performance can be good, please share.

This PCB and schematic of USB to Serial converter using PL2303HXD chip.-This is PCB and schematic of USB to Serial converter using PL2303HXD chip.