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audioguru said:I haven't seen a DTMF decoder IC for about 30 years.
Nigel Goodwin said:You're going back 30 odd years, things have moved on a LOT since those primative days!.
mytech said:Thanks a lot to all...
Actually i wanted to control devices around 10 using 4 digit password for security purpose via wireless...
I deciede DTMF , If you say this an old technique suggest me present tech.
I am little unawareness in this case.
Thanks...