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在使用收音机时,常因为无定时装置而又忘了关机使它长时间工作,这样不但缩短了电池使用寿命,同时对收音机的使用寿命也有一定影响。假如给它加装一个定时电子开关,那么这些问题也就解决了,但如用传统的继电器等触点式开关不但灵敏度不够而且体积也很大,我向大家介绍的 TTL 集成电路指触式定时器不但体积小(可装入收音机内),而且使用十分方便。电路如图1所示。这个指触式电子开关是使用 TTL 集成电路中的一个 TTL 与非门。由于电路要求不高,只使用一个 TTL与非门,并且只使用了一个输入端,所以可以使用处理品,
In the use of radio, often because there is no timing device and forgot to shut down to make it work for a long time, this will not only shorten the battery life, but also have a certain impact on the life of the radio. If it is to install a timer electronic switch, then these problems will be solved, but as with the traditional relay contact switch not only not enough sensitivity and size is also very large, I introduced to you TTL IC finger touch timing Not only small size (which can be loaded into the radio), but also very easy to use. Circuit shown in Figure 1. This touch-sensitive electronic switch uses a TTL NAND gate in a TTL integrated circuit. Due to circuit requirements is not high, using only a TTL NAND gate, and only uses one input, so you can use the processed products,