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DTMF Hack – How to Make a DTMF Decoder!

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You know, DTMF is probably out of use now because it’s mainly used on analog wired telephones.  When you press numbers to call someone on your grama’s telephone, you are basically making DTMF tones.

For those of you who want to mess around making your own spy gadgets, you might want to learn how to make a DTMF decoder.  I really think that you would be far better off making a GSM-hack device of some sort that

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