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Linear audio amp. chips

Discussion in 'Electronic Basics' started by Man-wai Chang, Aug 11, 2012.

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  1. Which audio amplifying chips are the most popular among cheap sub US$20
    portable speakers?

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  2. Jon Kirwan

    Jon Kirwan Guest

    I've not opened one up to find out, but look for the TDA8551.
    I just bought a few at 50 cents each and they are designed,
    so far as I can tell, for exactly those kinds of computer
    speaker systems. I have different purposes for mine, though.

    Jon
     
  3. I've not opened one up to find out, but look for the TDA8551.

    Thanks!


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  4. I've not opened one up to find out, but look for the TDA8551.

    Seems that it's quite hard to buy this one... at least not easy in Hong
    Kong...


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  5. Jon Kirwan

    Jon Kirwan Guest

    Odd. I got mine from Avnet. I have 100. More than I need. If
    you don't require a regular source, email me and I'd be happy
    to send some along.

    As another option perhaps, try doing a search with
    octopart.com and findchips.com and see if the sources they
    list are also available to you. The names I see, with stock,
    are Newark, Future, Digikey, Mouser, Distrelec Italia,
    element14, Quest, Bristol Electronics, etc. I would imagine
    that element14 should be accessible to you, at least.

    Jon
     
  6. Odd. I got mine from Avnet. I have 100. More than I need. If
    My email address is real. Let's chat via email.

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  7. Jon Kirwan

    Jon Kirwan Guest

    Sent.

    Jon
     
  8. My email address is real. Let's chat via email.
    Please check my reply.

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  9. Mark Zenier

    Mark Zenier Guest

    Sample size of one. ;-)

    I bought a set of USB powered amplified speakers at a garage sale and,
    of course, took them apart to see what was inside, (to find what the
    power supply range was).

    It used a You Wang UTC2025 stereo amplifer chip. The datasheet says
    that's good from 3-12 volts. It says minimum current draw is 40 mA,
    so that might be a bit much for battery power.


    Mark Zenier
    Googleproofaddress(account:mzenier provider:eskimo domain:com)
     
  10. Jon Kirwan

    Jon Kirwan Guest

    There's also the LM4928 from TI that is a stereo version. And
    the TDA8581, the stereo version of the TDA8551 I'd mentioned.
    (I didn't mention the TDA8581, partly because it is hard to
    get.) The LM4928 also isn't easy, though Mouser appears to
    have them (at $1.35 ea.) I don't know anywhere to get the
    UTC2025. Not anywhere. So I'd be stuck with the 1.2W LM4928
    if I were looking as a hobbyist, I think, for stereo versions
    (of the three I know about, anyway.)

    By the way, the TDA8551 and TDA8581 and LM4928 all have very
    low power modes. And the Iq of the TDA8551 is 6mA typ, 10mA
    max and is very avaialble. The LM4928, which is at least
    "gettable" has an Iq of 4mA, 7.5mA max.

    Interesting what was being used in the speakers. Didn't know
    about that part. (Got the data sheet, though.. WOW, you are
    right about the Iq!)

    Jon
     
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