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    DTMF decoder HT9170D is not detecting tones properly

    Thanks for the feedback.... I will try this and update as soon as possible... My controller (ATMEGA64A) is powered up by 3.2v supply.., as per your suggestion if i power up the DTMF decoder from 5v,then DTMF outputs D0 to D3 and DV signals will be 5v. Can i give this 5V signal directly to the...
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    DTMF decoder HT9170D is not detecting tones properly

    can any one give me the component values of DTMF decoder HT9170D for vdd of 3.2v....
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    SIM900A gsm module is switching off automatically.

    Thanks for the reply I am pulling it only for 3 seconds and releasing it.... Gsm module will be working for 1 or 2 minutes but after that it just switches off....
  4. S

    SIM900A gsm module is switching off automatically.

    Dear friends, I use SIM900A in my project.My problem is once i switch on the GSM module using POWER KEY,it will be on for 1 or 2 minutes but after this GSM module is switching off automatically... Please help....
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    DTMF decoder HT9170D is not detecting tones properly

    Dear friends, In my project i use SIM900A gsm module and HT9170D dtmf decoder and Atmega64a controller. DTMF decoder is not detecting the tones properly....some times it works and some times it does not work. I use the same application circuit as given in datasheet page number 8,application...

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