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
    1,190
    129
    Search for "dtmf schematic" on the net ; it will provide what you need.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    293
    How about pulse dialed telephones? That is the primary use of DTMF.
     
  4. Externet

    AAC Fanatic!

    Nov 29, 2005
    1,190
    129
    Pulse ??? :(
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
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    Alright, tone.
     
  6. Audioguru

    Expert

    Dec 20, 2007
    10,387
    1,140
    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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