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UM3482 Melody IC

Discussion in 'General Electronics Discussion' started by vick5821, Aug 3, 2012.

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  1. vick5821

    vick5821

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    Jan 22, 2012
    Hey there, I am connecting this IC according to the right hand side diagram. And it works. But then that connection will just keep repeating the same melody. So, how can I modify it so that I can play all the 12 melodys available in the IC AUTOMATICALLY when the supply in ON? I plan to make a music box that can play the 12 songs automatically.

    Thank you

    [​IMG]
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    12,457
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    Nov 17, 2011
    Select playing mode 2 (see datasheet).
    Add a timer that triggers CE such that after each song CE has a L-H edge transition. You will have to set the rate of the timer according to the length of the songs.
    Use e.g.a 555 timer IC
     
  3. vick5821

    vick5821

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    Jan 22, 2012
    I think the time for all the songs are not consistent ><
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    You could try to detect the end of a song by looking at the AC signal at the speaker - transistor connection. If this signal goes to static HIGH for some time (depending on the intervall between songs) the end of a song has been reached. You can generate an L-H edge to trigger the IC from that intervall by using a low-pass and a Schmit-Trigger.

    I'll leave the details to you.
     
  5. vick5821

    vick5821

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    Jan 22, 2012
    How's the algorithm for this ?
     
  6. Harald Kapp

    Harald Kapp Moderator Moderator

    12,457
    2,985
    Nov 17, 2011
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