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Driving a speaker (or headphones) with ARM (LPC2138)

Discussion in 'ARM' started by juvan, May 23, 2011.

  1. juvan

    juvan New Member

    Joined:
    May 23, 2011
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    Hello

    I am freshly new here, so I hope this is the correct place to post this question. If not, I apologize.

    I would like to connect a sound playing device (speaker, headphones), which ever is easier, to my ARM's ( LPC2138 ) DAC converter. My question is, what should the circuitry - that is connected to the ARM's DAC pin - for the speaker be. I am not interested in the quality of the sound, all I need is a rough sound, to see that it works.

    I found this circuitry but I don't know if it is at all correct or, what the modifications should be, or if there is perhaps an easier way, since I don't have that specific amp.
    http://www.electro-tech-online.com/attachments/amplifier-with-minimum-parts-png.23965/

    The speaker that I have is 5W, 4ohm. The headphones are just your standard MP3 little ones. I would prefer to connect it to the speaker though.

    Thanks for your time and any help.
     
  2. پروژه های الکترو

    پروژه های الکترو Member

    Joined:
    Apr 20, 2012
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    تهران اندروید
    Hi there,

    You can also use LM385 but I suggest TDA7052 which is very common and cheap.
    Also it needs minimum external parts, usually just a coupling cap!
     
    Last edited: Apr 21, 2012

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