邮政自动出售机告警电路的作用是:当机器发生长出物、物售完、硬币找完和投入伪币时,发出告警信号,以便及时处理。告警电路由五只三极管和警铃等组成(见图1)。当告警电路工作时,告警铃(DL)发出告警声。目前,各出售机所使用的警铃均为一般的电铃。我局使用的是广州电讯器材厂生产的3伏夜 Post automatic vending machine alarm circuit role is: When the machine has grown material, sale finished, coins Finished and put into counterfeit money, the alarm signal for timely processing. Alarm circuit consists of five transistors and alarm components (see Figure 1). When the alarm circuit work, alarm bell (DL) issued a warning sound. At present, the bells used by the vending machines are all ordinary bells. Our bureau is using 3 volt night produced by Guangzhou Telecommunication Equipment Factory