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本文介绍的病房呼叫器,用两根导线就可以把十个病房呼叫信号传入值班室的呼叫器。当按下呼叫按钮开关时,呼叫器即可相应地显示出几号病房,并同时发出声响告警。电路原理见图。集成电路S L322C和D_4～D_(13)R_(13)～R_(22)等组成病房号指示电路。当S L322C的1端输入0.7V时,第一个发光二极管发光,输入1.4V时,第二个发光二极管发光,输入2.1～7V时,发光二极管就依次发光。所以,只要通过各个不同值降压
This article describes the ward caller, with two wires to the ward call signal into the ten duty room call device. When you press the call button switch, the pager can display a few wards accordingly, and at the same time make an audible alarm. Circuit diagram shown. Integrated circuit S L322C and D_4 ~ D_ (13) R_ (13) ~ R_ (22) and so on constitute ward number indication circuit. When the S L322C 1 input 0.7V, the first LED light, input 1.4V, the second light-emitting diode, the input 2.1 ~ 7V, the light-emitting diodes on the order of light. So, just buck through the various values