利用电子表加上控制电路组成的定时器,具有定时准确,简单易制,成本低廉的优点,广泛应用于定时充电、定时开、关机、定时呼叫等场合。现介绍采用带定闹功能电子表作时间控制的定时器电路。带定闹功能电子表的型号不限。电路图如图1所示。无闹铃信号时,三极管V1、V2均截止,继电器K不吸合。有闹铃信号时,此信号 The timer with the electronic watch plus the control circuit has the advantages of accurate timing, simple and easy system and low cost, and is widely used in occasions such as timed charging, timed on and off, and timed calling. Are introduced with the electronic alarm clock function for time control timer circuit. There are no limits with the model of electronic models. Circuit shown in Figure 1. No alarm signal, the transistor V1, V2 are off, the relay K does not pull. When there is an alarm signal, this signal