Help me with input connection in a DTMF project

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popat_panjaru

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DTMF Project help

hi to all

i m making one project related to DTMG Decoder

bt i m confused what should i have to do at the time of giving its input?..

i m using MT8870..so on which pins i have to apply audio inputs?...

can anybody send me input connection for it

Popatlal Panjarawala
 

Re: DTMF Project help

This circuit diagram show the connection of 8870


and use this attached DTMF tones file to test your circuit:
:arrow:
 

Re: DTMF Project help

so that means there is only one input for MT8870?????...right?????

that is audio input????.....

actually when i had open my phone module at that time i had found that there are two wires of input...one is red and another is black...which are connected to input side which they told that these are audio input for it?.....

so can u give me solution for it..bz the circuit which u had send contain only one input...only on pin 2 and 3 which is shorted....

my problem is that i want to connect my audio input to DTMF Decoder....

Popatlal
 

Re: DTMF Project help

you can apply your audio input between dtmf input and GND as shown in the image
 

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