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multi channel dtmf decoder

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Oubada_ot

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multichannel dtmf

Hi, I wanna design a multi channel dtmf decoder, I wanna decode 3 phone lines, but the problem is how can I make it without putting the same ground for each line. Cause when i put the same ground any change on any line appears on the 3 8870 output. so can you pls help me?
 

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