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Remote Control Using Telephone


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I am working on a project that will be able to remotely control certain appliances through the use of the telephone:

I understand that KT3170 is a DTMF Decoder IC, however this is not available locally in the PHILIPPINES. I am looking for an equivalent IC component for it. I have searched google and  found that MC145436 and MT8870 can be used. I search on available electronic shops but there was no available ICs for the three(3) mentioned above. Is there anymore equivalent IC I can use as replacement?

Thank you for the help.

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