具有12位LED数码管显示，可分别显示电压、电流、计数值。
With 12 LED digital display, can show the tube voltage, current and count value.
该系统的数字电压表电路简单，可以测量0 ~ 5 V的电压值，并在四位LED数码管上轮流显示或单路选择显示。
The system's digital voltmeter circuit is simple, can measure the voltage 0 ~ 5v, and the four turns on the LED digital display or a single select Show.
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