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贵刊1993,№2所载利用 TWH8778大功率驱动开关集成电路制作的液位自动控制装置,原线路有明显错误,根本不能如所述那样正常工作。由原图可见,当水位低于 B 点时,与⑤脚相连的 B、C 点悬空,不呈高电位,抽水机不会启动工作;当塔内水位在 B 点以上时,A、B 两点借水导通,使⑤脚呈高电位,从而抽水机一直工作。笔者曾按原图制作,证实以上分析
Your publication 1993, № 2 contained in TWH8778 high-power drive switch integrated circuit production level automatic control device, the original line has obvious errors, simply can not work as described. As can be seen from the original figure, when the water level is lower than the B point, the B and C points connected to the ⑤ foot are vacant and do not assume a high potential, and the water pump does not start working; when the water level in the tower is above B, the A and B points By water conduction, so that ⑤ feet were high potential, so the pump has been working. The author has produced according to the original image, confirmed the above analysis