https://electrosofts.com/dtmf/ is the link for encoder 91215 and decoder mt8870 circuit is also used from datasheet but the dtmf tone from encoder can not be realized using dtmf decoder .
I used the circuit from datasheet but don't work so any body has circuit for realizing the dtmf tone from encoder 91215B using mt8870
I used the circuit from datasheet but don't work so any body has circuit for realizing the dtmf tone from encoder 91215B using mt8870
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