DTMF_RECEIVER_DECODER

Published:2009/7/13 3:36:00 Author:May | From:SeekIC

This decoder uses a G8870 DTMF receiver decoder chip to decode DTMF signals and drive individual outputs via a 4028 binary-decimal decoder. Xtal is a 3.579-MHz TV burst crystal. C1=C2=0.1μF, R1=R2=100 kΩ and R3=300 kΩ. D1 through D4 are small red LEDs.



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