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    Dtmf detection in GSM modem

    Hi...................

    I am doing a project on GSM.. In that i want to detect the key pressed at the other side on active call.... I am trying with a dtmf decoder circuit at speaker output but it is not working...Plz if any one has any other idea or solution plz reply...........

    •   Alt11th November 2010, 07:05

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    Re: Dtmf detection in GSM modem



    if you make it like the above?
    if so .... check Keytone volume on your mobile GSM because if a small volume will not work, should Keytone maximum volume

    hopefully can help


    1 members found this post helpful.

    •   Alt11th November 2010, 08:30

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    Dtmf detection in GSM modem

    Thank you.............

    I have attached mobile phone speaker to Gsm modem ... so any way its volume is less... so what can i do to get more volume ......



    •   Alt11th November 2010, 08:40

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    Re: Dtmf detection in GSM modem

    Quote Originally Posted by Manu.electronics View Post
    Thank you.............

    I have attached mobile phone speaker to Gsm modem ... so any way its volume is less... so what can i do to get more volume ......
    try wearing a mini power amplifier, the input from these speakers while the PA output decoder 8870 connected to the input ....

    so I can better understand your project for you please attach your project schematic



  5. #5
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    Re: Dtmf detection in GSM modem

    Quote Originally Posted by wanditea View Post
    try wearing a mini power amplifier, the input from these speakers while the PA output decoder 8870 connected to the input ....

    so I can better understand your project for you please attach your project schematic
    Thank you ya... It worked......I used a similar circiut what you hv posted......



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