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DTMF wireless paging system circuit diagram

2016-11-27 09:08  
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DTMF wireless paging system circuit diagram
IT usesDTMF encoder output dual tone multi-frequency coded signal to modulate the transmitted carrier frequency. It can form a DTMF encoded radio paging system. The circuit uses DTMF encoding UM97085 and decoding circuit YN9101 circuit to form a small wireless paging system for small internal paging. It is convenient and economical. It is shown in the figure, in which (a) shows the radio transmitting DTMF encoding circuit. Figure (b) shows the radio receiver demodulation, DTMF decoding and reproducing sound signal circuits.