DTMF_DECODER_II

Published:2009/7/13 3:34:00 Author:May | From:SeekIC

This decoder uses a 68870 DTMF receiver decoder chip to decode DTMF signals and display them in binary via LEDs. 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.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/DTMF_DECODER_II.html

Print this Page | Comments | Reading(3)