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这种方便的电路是为电池工作的设备而设计的。它能起到触摸接通电源,延时关闭电源的作用。图1示出了这种只需几百毫安的电路,图2与图1相似,但在输出端增加了一个FET管,使转换电流达到300mA。有源电子部分由6个施密特触发器(40106型组成),触摸键由两片小的,能通过人体的电阻互联的导电片组成。当这个键没有被触模时,R_1在IC_(1a)的输入端产生一个高电平,门电路之后跟随一个二极管D_1,只要IC_(1a)的输出为高电平,D_1就能保证使C_1充电。当这个键被触摸时,C_1被迅速充电,这个
This handy circuit is designed for battery operated equipment. It can touch the power, delay the power off. Figure 1 shows this circuit requiring only a few hundred milliamps. Figure 2 is similar to Figure 1 except that an FET is added to the output to bring the conversion current to 300mA. The active electronics consists of six Schmitt-triggered flip-flops (Type 40106). The touch key consists of two small, conductive pads interconnecting the body’s resistors. When this key is not touched, R_1 generates a high level at the input of IC_ (1a), followed by a diode D_1 in the gate. As long as the output of IC_ (1a) is high, D_1 ensures that C_1 Charge. When this key is touched, C_1 is quickly charged, this one