14-12-2015, 02:39 PM
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http://electronics-diydtmf-decoder-using-mt8870.php
http://worldofmcu2012/12/dual-tone-multiple-frequency-dtmf.html
if you again feel trouble on why dtmf receiver mt8870 operates in 3 579mhz please reply in that page and ask specific fields in why dtmf receiver mt8870 operates in 3 579mhz