Telephone operated calling system seminar report/pdf/ppt download
Introduction : Telephone operated calling circuit converts DTMF signal to its binary equivalent. This circuit consists of a DTMF receiver IC which converts a DTMF input signal in to its binary equivalent.
This binary signal is decoded and displayed as its decimal equivalent through the decimal display unit. At the same time it provides a sound alerting signal which informs the people that a number is displayed.
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