A little help please regarding Amps?(LM324)

Discussion in 'The Projects Forum' started by nadjatee1996, Aug 11, 2011.

  1. nadjatee1996

    Thread Starter New Member

    Aug 11, 2011
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    I have a LM324 Op-Amp, but to be honest, I have no idea how to use it...I understand a moderate amount about electronics, with the exception of reading schematics, but this project I'm making sounds simple enough. I just want to make a little amplifier for my speakers, so it can be a bit louder, I plan on using a few(or a lot) of 1.5v button batteries. Anyways, I got no idea how to use my LM324, I understand that 1in- and 1in+ yields a 1out, but my speakers have a + and - inputs, so how do I make that work?Also, the ground wire goes...where( a piece of plastic?)?
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Well, you have the wrong IC for the job. The LM324 is a small signal amplifier, not an audio power amplifier. Also, it's only good at rather low frequencies; not something you'd really want to run audio through.

    You could use an LM386; here's a datasheet for that amplifier:
    http://www.national.com/ds/LM/LM386.pdf
    See the example schematics in the datasheet.
    It's not very powerful, but if you're using button batteries, you're not going to get much power out of them anyway.
     
  3. nadjatee1996

    Thread Starter New Member

    Aug 11, 2011
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    1) would it be loud enough? I wnat it to be pretty loud, not SUPER loud, but decently enough
    2) is it sold at RadioShacks?

    Also, I was wrong, it's gonna be powered by my iTouch, not button batteries...
     
  4. SgtWookie

    Expert

    Jul 17, 2007
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    1) "Loud enough" is purely subjective; I have no clue what your speakers are, or what they are rated, or what you were powering them with before. An LM386 is a low power audio amp.

    2) Yes.

    3) I have absolutely no clue as to what voltage or power is available from an iTouch, which will have a large bearing on how loud the output will be.
     
  5. Adjuster

    Well-Known Member

    Dec 26, 2010
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    If you cannot read schematics, then I think you will need to learn to do so before you will be able to do much with electronics.

    For anything but a really simple circuit, it is very difficult to describe how to connect something up in words. Understanding a verbal description of a circuit without reference to a diagram is also pretty hard work. The old saying that "a picture is worth a thousand words" applies very well to electronics.
     
    Last edited: Aug 11, 2011
  6. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The output loudness from an LM386 power amplifier into an 8 ohm speaker when it has a 9v supply sounds the same as a cheap clock radio.
     
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