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Call display circuit diagram

2016-12-07 13:41  
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Call display circuit diagram
LEDcan automatically display various function afterpicking up the machine. It is used to display the working state of the telephone. For the reason that it adopts a integration technology, the circuit has the advantages of small volume, high reliability, less external components, convenient assembly, low power consumption and low cost.Work principleis as shown in Figure 143. When you pick up the machinethe key switch STL closes. Integrated operational amplifying circuit LM%8's pin6 andpin0 willrecieve 9V DC voltage.