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图1中的电路基于以前出版的设计实例(参考文献1),仅用3条I/O线路来驱动12个LED。在本应用中,电路充当电动车引擎的转速计,并在一组排列成直线或圆弧形LED上显示引擎相对速度。三对反向
The circuit in Figure 1 is based on a previously published design example (Reference 1) that uses only three I / O lines to drive 12 LEDs. In this application, the circuit acts as a tachometer for an electric car engine and displays the relative engine speed on a group of linear or circular LEDs. Three pairs of reverse