dtmf testing

Discussion in 'The Projects Forum' started by miso, Aug 25, 2010.

  1. miso

    Thread Starter New Member

    Aug 25, 2010
    2
    0
    i have been trying to test the dtmf mt8880 ic just to check the output frequency and check how its working i have followed the connection shown in the data sheet but apparently i have failed to get the desired frequencies for the keypads :( any suggestion ???!!!


    thanks alot in advance
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Post your circuit and explain what is wrong with the frequencies (wrong frequencies or none at all).
     
  3. miso

    Thread Starter New Member

    Aug 25, 2010
    2
    0
    thanks for the concern ,,
    actually i fed up trying with it:( the circuit i used for testing is attached i have used the connection in fig 13 for testing and i failed to get an output frequency from it any idea if the dtmf ht9200b is easier to deal with ?
     
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