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Hi I do not have telephone so i need a dtmf decoder tone to test the IC.. If any one have just upload it. i tried already by given mobile output tone via earphone, but it didn't work..
Thanks.
You can purchase DTMF encoders, completely assembled, as accessories to be added to older amateur radios. These are still available as far as I can tell and the cost is reasonable ($20 US maybe). That's not quite what you wanted but it could be an alternative for you.
A thought - if you know someone who is a radio amateur you might record a transmission via a scanner. VHF and UHF handhelds and mobile radios almost all have DTMF keypads on the microphone. Again, not what you asked for but an idea.
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