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第二讲触摸开关电路触摸开关电路是一个电子开关电路,它通过用手指触摸两个不相通的导体,达到控制电路的通或断。一.预备知识 1.以后各讲均使用555集成电路,现在我们将陆续介绍555的有关内容。 555集成电路在70年代研制出来,主要做定时器用,称之为时基集成电路。由于该电路适应电压可达5～18V,能输出200mA电流,可直接驱动继电器、发光管、指示灯和喇叭等,作为振荡器时工作频率可达300kHz,所以用途极为广泛。我国生产的555有:5G1555、FX555、FD555等,555前面的字头是厂家或公司的标记。我们经常使用的是一种双列直插8脚塑料封装的集成电路(如图1),上面标有NE555的字样。
The second touch switch circuit Touch switch circuit is an electronic switching circuit, which through the touch of two fingers do not communicate with the conductor, to control the circuit on or off. I. Preparatory Knowledge 1. After each spoke using 555 integrated circuits, and now we will continue to introduce 555 of the relevant content. 555 integrated circuits developed in the 70s, the main timer to do, called the time base integrated circuits. As the circuit to adapt to the voltage up to 5 ~ 18V, 200mA output current can be directly driven relays, LED, lights and speakers, etc., as an oscillator frequency up to 300kHz, so the use of a very wide range. 555 produced in China are: 5G1555, FX555, FD555 and so on, 555 prefix in front of the manufacturers or companies mark. We often use a dual in-line 8-pin plastic package integrated circuit (Figure 1), marked with the words NE555.