![]() (Check DTMF Tone Generator Circuit in the circuit diagram tab 1) The 4 bit digital output of MT8870 can be given to micro controller that will control any device or any application as per the button pressed on 91214B based remote control.įirst let us see how to build DTMF tone generator circuit Using these two circuits together one can build DTMF based remote control application in which 91214B chip is used as remote control and MT8870 is used at the receiver side to decode DTMF tones. Cell phone controlled devices and applications ![]() DTMF based remote control receiver in wireless control application ![]() DTMF encoded numeric keypad in security applications DTMF remote control transmitter in wireless control application The given project describes how different DTMF tones can be generated using DTMF tone generator chip 91214B and how these tones can be decoded by DTMF decoder chip MT8870 that generates 4-bit digital output.
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