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DTMF ht9170b How to connect mobile Tone ???

i work robotics

Usually people use "acoustic couplers" for these things, otherwise you're patching into the mic, and you'll need to use a summing amp, if you want to keep the mic as well
Avadhut.Deshmukh (author)  steveastrouk2 years ago
no

I work Robotics
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