1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

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

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

  1. juvan

    juvan New Member

    May 23, 2011

    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.

    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

    Apr 20, 2012
    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

Share This Page