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DTMF Decoder Using MT8870
MT8870 equal to HT9170 IC Dual Tone Multi Frequency (DTMF) receivers

Dtmf Schematic Diagrams - Circuit Diagram

The Decoding Intergrated Circuit of HT9170-DTMF Two-tone Caller Display

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DTMF Receiver Sample Test Circuit KT3170 MT8870 – Electronics Projects