1 1 2 1 6 3- 1 1 2 1 9 6 1 1 # 9 6 3 2- # # 9 6 9 6 . The DTMF generator above has the ABCD key sequence from the Silver Box – phone phreak phavorite. . 1209 Hz 1336 Hz 1477 Hz 697 Hz 1 2 3 770 Hz 4 … Continue reading Happy 50th DTMF
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