Music On Hold Circuit

  
When an asterisk * is pressed on the touch-tone phone, TCI a DTMF decoder, controls on-hold logic. Audio from the FM receiver IC4 is.placed on the telephone line when a hold condition is present. RY2 is a DPDT 12-V relay. To place a caller on hold,
Music On Hold Circuit - schematic

press the asterisk button on the touch-tone phone and hang up the handset.




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