The DTMF wireless calling system circuit

  
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By the dual sound multi-frequency encoding signal, the circuit modulates the emitted carrier frequency, and it composes a DTMF encoding wireless calling system circuit. The circuit uses DTMF encoding circuit UM97085 and decoding circuit YN9101 to form a micro wireless calling system, which is used in small enterprises, and it is convenient and economic. See..
The DTMF wireless calling system circuit - schematic




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