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错误有:1、三极管VT2输出信号应经R6送入计数器N6的第9脚、R6与78L05的输出相连有误。2、霍尔传感器信号输出一般是OC(集电极开路)输出,需要加上拉电阻。原文电路用霍尔元件直接驱动三极管VT2、似乎不妥。应在N2的输出脚到+5V电源间加上拉电阻。3、电路用串联降压方式供电能耗太大,建议用DC-DC电源变换器供电。
Wrong there: 1, transistor VT2 output signal should be sent to the counter N6 R6 9 feet, R6 and 78L05 connected to the output error. 2, Hall sensor signal output is generally OC (open collector) output, the need to add pull-up resistor. It seems that the original circuit directly drives the transistor VT2 with a Hall element. Should be in the N2 output pin to +5 V power supply between the pull-up resistor. 3, the circuit with series buck power supply is too large, it is recommended to use DC-DC power converter power supply.