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 figu..

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