[SOLVED] Dtmf detection in GSM modem

[Manu.electronics]

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...........

 

[Li_ereunpisan]

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

 

[Manu.electronics]

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 ......

 

[Li_ereunpisan]

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

 

[Manu.electronics]

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......