DTMF_DECODER_I

Published:2009/7/13 3:27:00 Author:May | From:SeekIC

This decoder uses a G8870 DTMF receiver decoder chip to decode DTMF signals and display them via an LED display driven by a 7448 decoder driver chip. 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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