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The 40-line medical use wireless calling system circuit

2016-11-05 04:37  
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The 40-line medical use wireless calling system circuit
In figure 1 is one of the encoding emitter circuits, the system is equipped with 40 emitter circuit. In figure 2 is the reception display circuit. We divide the 40 codes into 4 teams, i.e 0, 1, 2 and 3 (only team 0 and 1 have drawn in figure 2). For the 10 codes 00~09 in team 0, all the address pins of the decoding circuit are suspended, when the receiver gets signals from an emitter of team 0, the signals are decoded by IC1 and encoded by IC5, and the corresponding indicator in LED00~LED09 are lit as memory.