the dtmf problem - watch out the duplicate ic's

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welove8051

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the dtmf problem?

hello friends, i had designed 'dtmf based device control' and a sample project is here at www.free8051projects.blogspot.com, the problem is some of the tone are not recoginised by the dtmf decoder and it differs for each cellphone, what can be the problem and solution for the same.


regards
kj
 

Re: the dtmf problem?

hi to all, i figured out the problem. it is because of the Chinese duplicates. even though the circuit is correct, the duplicate ic doesn't provided the intended output.

at this moment.
i like to warn the beginners about this problem, they have to make sure they are getting the original ic's.


regards
kj
 

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