基于UC3845的高压发生电路，将12V转化为400V的高压模块。-This source can used to design a high-voltage supply by used the chip of UC3845.

。典型的RS232 信号在正负电平之间摆动，在发送数 据时，发送端驱动器输出正电平在+5～+15V，负电平在-5～-15V 电平。接收器典型的工作电 平在+3～+12V 与-3～-12V 之间。-. Typical RS232 signal level swing between positive and negative, when data is transmitted, the transmitter side driver outputs a positive level in+