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[SOLVED] Dtmf detection in GSM modem

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Manu.electronics

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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...........
 

schematic.png


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:p
 
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 ......
 

Manu.electronics said:
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 ......
Click to expand...

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
 

wanditea said:
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
Click to expand...

Thank you ya... It worked......I used a similar circiut what you hv posted......
 

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