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看到《家庭电子》1998年第6期第18页中刊登的“电风扇红外遥控触摸控制电路”一文,笔者认为该文图1中存在两个技术错误,现分析如下: 1.YF1输入端不应悬空CMOS电路的特点之一是输入阻抗很高,输入电流极小,因而输入端控制灵敏度很高,因此,在正常使用时,CMOS门电路的输入端是不允许悬空的,因为输入端悬空将使输入端电位不确定,导致整个电路工作不稳定或根本无法正常工作。通
See “Home Electronics” 1998 the sixth period page 18 published in the “fan infrared remote control touch control circuit,” a text, I believe there are two technical mistakes in Figure 1, are analyzed as follows: 1.YF1 input Should not be dangling CMOS circuit is one of the characteristics of high input impedance, the input current is very small, so the input control sensitivity is high, therefore, in normal use, the CMOS gate input is not allowed to float, because the input Dangling will make the input potential is uncertain, resulting in the entire circuit is unstable or simply can not work properly. through