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The DTMF wireless calling system circuit

2016-11-12 02:28  
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The DTMF wireless calling system circuit
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 as the figure, (a) represents the DTMF encoding wireless electric emitting circuit, (b) represents the wireless electric reception demodulating, DTMF decoding and stereo signal sound system.