工厂、机关以及学校等单位作息起居一般均以电铃为号。本文介绍的自控打铃器电路简单,成本低廉,适合欲购置自控打铃器的单位或生产厂家参考。图1是其主要部分的电路图。 本自控装置的原理主要基于以一定的间隔访问存储器,从存储器中读出有关信息控制电铃电源的开关。表1为某工厂作息时间表。从时间表中可以看到,我们以10min为间隔足可满足精度要求。但为了电路实现上的方便,我们以1min计算。这样,一 Factories, institutions and schools and other units are generally in charge of rest from the bell for the number. This article describes the automatic pilot bell circuit is simple, low cost, suitable for the purchase of self-piloting bell unit or manufacturer reference. Fig. 1 is a circuit diagram of the main part thereof. The principle of the self-control device is mainly based on a certain interval to access the memory, read out from the memory information about the control bell power switch. Table 1 for a factory schedule. As can be seen from the schedule, we can meet the accuracy requirements with 10min intervals. However, in order to achieve the convenience of the circuit, we 1min calculation. In this way, one