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achourwissem
achourwissem
Associate III
August 22, 2013
Question

stm32f4 Signal generation

  • August 22, 2013
  • 6 replies
  • 1324 views
Posted on August 22, 2013 at 11:12

hello

i tried the DAC_SignalsGeneration st exemple and i hear nothing , my clock config and all are so fine, so  anyone could give me a simple working code to hear any signal ? and thnx :)
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    6 replies

    ran2
    ran2
    Associate II
    August 22, 2013
    Posted on August 22, 2013 at 12:52

    It works fine on my board. Did you press the user button?

    frankmeyer9
    frankmeyer9
    Associate III
    August 22, 2013
    Posted on August 22, 2013 at 14:36

    ... and i hear nothing , ...

     

    What do you expect to hear ?

    The DAC has an output impedance of about 1 Megaohm w/o buffer amp., and 15 kOhm with amp. That is hardly enough to drive anything passive that creates audible sound.

    Use a scope as clive suggested, or attach an appropriate amplifier circuit.

    achourwissem
    achourwissemAuthor
    Associate III
    August 22, 2013
    Posted on August 22, 2013 at 14:48

    thank you so much

    anyway that appropriate amplifier circuit could make it audible ? if yes then plz provide me any schématics for that amplifier and thnx
    Tesla DeLorean
    Tesla DeLorean
    Guru
    August 22, 2013
    Posted on August 22, 2013 at 16:03

    I don't want to wade into this too deeply, but doesn't the F4-Discovery have some of this routed through the codec to the audio jack? I guess you'd want to look at the schematic and demo code to see how that's done, and programmed. May be there are some blog, tutorial or videos on doing it?

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    achourwissem
    achourwissemAuthor
    Associate III
    August 23, 2013
    Posted on August 23, 2013 at 10:03

    okay thank you all for advices :)

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