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这里介绍的简单电路(见图)可以作为一个电子密码锁或解除警报系统用途.电路采用三个硅可控管(SCR)作为触发顺序接通开关,然后启动一只继电器而使外接电路工作.密码选择器S_1是一个有10个挡位旋转式选择开关,S_2是键入按钮.其操作过程是:首先旋动S_1,选择一个数字挡位,例如是7,然后按动S_2,如果挡位正确,SCR_1会被接通,于是LED_1亮着,表示所选号码正确;然后选择第二个号码,例如是10,按动S_2,SCR_2会
The simple circuit described here (see photo) can be used as an electronic code lock or de-alarm system.The circuit uses three Silicon Controlled Rectifiers (SCRs) as the triggering sequence to turn on the switch, and then start a relay to operate the external circuit. Password selector S_1 is a 10-position rotary selector switch, S_2 is the type button, the operation process is: First, rotate S_1, select a digital gear, for example, is 7, and then press S_2, if the gear is correct , SCR_1 will be turned on, so LED_1 is lit, indicating that the selected number is correct; then select the second number, for example, 10, press S_2, SCR_2