The DTMF wireless calling system circuit


Posted on Feb 4, 2014

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
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