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ST LM324N anyone have any schematics

Discussion in 'Electronic Design' started by Tim, May 24, 2007.

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  1. Tim

    Tim Guest

  2. It may not be loud enough for your taste. I mean, you even provided a
    datasheet; why don't you read it and do some math to determine the available
    output power?
    It would be better if you had a book rather than the scope. Get a hobby
    electronics book or magazine with some example circuits and build a dozen of
    those. Then modify the circuits to fit your needs. Finally, start designing
    on your own. That's what got most of us started here.

    Of course the 'Net is full of hobby stuff as well, but it often takes some
    experience to judge if something is hard or easy to build, or if it is
    downright bogus. Printed publications specifically geared at the hobbyist
    are better in that regards. Elektor used to have those "300+ circuits"
    books, maybe they're still available.

    robert
     
  3. krw

    krw Guest

    Sure, but it would be rather horrid. You're not going to get any
    power out of it and the crossover distortion of a LM324 is pretty
    bad. The frequency response won't be anything to write home about
    either.

    You could put a complimentary pair of transistors on the output.
    This will get you some more power but the crossover distortion will
    still be bad (and frequency response worse).
    It's a good project to learn with.
     
  4. MooseFET

    MooseFET Guest

     
  5. John Larkin

    John Larkin Guest

    LM324 is terrible for audio. Use, say, an LF347. But 1/4 of a little
    opamp will never give you enough power to drive a speaker to useful
    levels. For that you need big parts.

    John
     
  6. Eeyore

    Eeyore Guest

    The first thing I'd suggest if you want decent audio quality is to avoid using
    the LM324. It's a really horrid op-amp.

    There are plenty of really good op-amps designed for high quality audio. You
    don't specify what supply voltages you intend to use but I'll start by
    suggesting the NE5532 dual op-amp. It's been around for over 30 years and cost a
    fortune when it came out. These days it's made by the bucketful and you can even
    buy them on ebay in small quantities for under $1 ea.

    Graham
     
  7. Eeyore

    Eeyore Guest

  8. GregS

    GregS Guest

    The 324 does source more current than most op-amps. One could use a quLITY amp
    than can drive 600 ohm loads, but the thing to do is use a device made
    for speaker loads. There are tons of those such as............
    http://www.national.com/pf/LM/LM384.html

    greg
     
  9. MooseFET

    MooseFET Guest


    The LT1230 will drive 30mA.

    0.03^2*8 = 7.2mW

    That is *way* louder than anyone needs for rap-music.
     
  10. krw

    krw Guest

     
  11. Rich Grise

    Rich Grise Guest

    There's no such thing as rap "music". Music has a melody, while rap is
    just noise. You might as well beat on a hollow log while dancing around
    a boiling missionary. (not that there's anything wrong with boiling
    missionaries!) ;-)

    Thanks,
    Rich
     
  12. D from BC

    D from BC Guest

    That's not going to get you anywhere... ;)
    Learn how to design electronics for toys.....or weapons systems..
    You'll make more money :p
    D from BC
     
  13. JeffM

    JeffM Guest

  14. I'm sure the missionaries have a different position on that. Last time
    I was talking to a missionary I mentioned that kid is taking a course
    primarily intended for "heritage language" students. He got this
    shocked expression on his face.. though I said it was intended for
    "heretics".


    Best regards,
    Spehro Pefhany
     
  15.  
  16. krw

    krw Guest

    What do you have against the missionary position?
     
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