餐厅、剧场、汽车站、火车站等处卫生间使用频繁。通常,卫生间内是否已有人使用不得而知,只有敲门讯问,而这样做又使卫生间内的人感到不愉快。要避免这种情况,可以加一个适当的指示器,以示明卫生间内是否有人。 这里的电路就是专为这种用途而设计的。虽然电路看来十分简单,但使用效果良好。电路的核心是一块CD4011集成电路,内有二个CMOS四与非门。我们只用其中二个门A和B,使其构成一个钟脉冲发生器。通常门A的引脚1通过电阻R1接地。这样可避免自激, Restaurants, theaters, bus stations, railway stations and other places to use the bathroom frequently. Often, it is not known whether the toilet has been used by someone or not. Only the door-to-door interrogation is done, which in turn makes people in the toilet feel unhappy. To avoid this situation, add an appropriate indicator to indicate if there are any people in the bathroom. The circuit here is designed for this purpose. Although the circuit seems very simple, but the effect is good. The core of the circuit is a CD4011 integrated circuit, there are two CMOS four NAND gate. We use only two of these gates, A and B, to make a clock generator. Usually pin A of gate A is grounded through resistor R1. This can avoid self-excited,