rpr220原理及其应用，光电对管探测器-rpr220 and its application, photoelectric detector on the tube

这是一个RPR220光电对光的资料，介绍的很详细。尤其对他的电路图分析的很透彻-This is a RPR220 light optical information presented in great detail. In particular, his analysis is very thorough schematic