dual tone multiple freq

Discussion in 'The Projects Forum' started by dark dragon, Dec 11, 2008.

  1. dark dragon

    Thread Starter Member

    Dec 11, 2008
    13
    0
    i need to use dual tone multiple freq in my mini project i need some details and example circuit for dual tone multiple freq
     
  2. Externet

    AAC Fanatic!

    Nov 29, 2005
    954
    93
    Search for "dtmf schematic" on the net ; it will provide what you need.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    290
    How about pulse dialed telephones? That is the primary use of DTMF.
     
  4. Externet

    AAC Fanatic!

    Nov 29, 2005
    954
    93
    Pulse ??? :(
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
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    Alright, tone.
     
  6. Audioguru

    AAC Fanatic!

    Dec 20, 2007
    9,418
    903
    My home still uses rotary dial pulses for dialing. So I don't pay the DTMF fee to Bell month after month and year after year.
    When I call my bank then I switch to DTMF after they answer and then do my banking like everybody else.
     
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