Low cost audio function generator(DDS)


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  1. #1
    Join Date
    Sep 2004
    Location
    montreal, canada
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    Talking

    Je dit... c'est le excellent prix pour le excellent produit ... yah!

    I don't know the following, and i don't know how good they are and are really far of the needed range here but...
    http://www.amqrp.org/kits/dds60/
    http://www.minikits.com.au/kits4.html

    Kinda time saver i guess.
    Last edited by mister_e; - 13th December 2006 at 07:37.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  2. #2
    Join Date
    Jul 2003
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    Sweden
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    Post

    Hi Speck,

    It should be possible to do with hardware PWM, espescially at low frequencies like that. I just never got it working very well at higher freqs, so i never really finished it off to see where the limits were. Feel free to carry out your own investigation cause it should be possible.

    I think it was probably due to the fact that the loop runs at 5000000/28=178,571kHz and the highest (useable) PWM freq was around twice that ....... no resolution. However, like i said, i never took it all the way, i got the results i wanted with the R-2R ladder.

    /Ingvar

  3. #3
    Join Date
    May 2004
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    NW France
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    Wink Appel au peuple...

    Hi,All

    I saw one application in a the French "Electronique Pratique" magazine, issue 247, page 86 ...

    But, halas, I didn't download the Pic ( Hex ) Program ... and it's no more available.

    May be someone has it in his computer memory ???

    Alain
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