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paralleling op amps

Discussion in 'Hobby Electronics' started by Mark Harriss, Sep 8, 2005.

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  1. Mark Harriss

    Mark Harriss Guest

    I've seen a few web sites where better performance
    into low R loads is achieved by paralleling op amps
    together. Has anyone tried this?, I've tried some
    TI NE5532 op amps: they run hot but seem to work.

    tia
    Mark
     
  2. Phil Allison

    Phil Allison Guest

    "Mark Harriss" = lying, PITA, criminal, artistic fool from Cairns

    ** Like this one:

    http://www.dself.dsl.pipex.com/ampins/webbop/opamp.htm#mult


    Post the damn links - you lazy, damnable ASS !!!!!!

    Got a clue what an op-amp " voltage follower " is ??????

    Yours wired that way ?



    ** Hot with a load or at idle???

    Idle dissipation will be about 300mW ( ie 10mA x 30 volts ).

    Under full load ( 7 volts rms into 220 ohms) add another 300mW at least.

    600 mW in an 8 pin DIL is hot.




    ............ Phil
     
  3. Andrew M

    Andrew M Guest

    Use a more suitable opamp.
    There are many high-drive opamps on the market. Paralelling them will not work,
    generally.

    Try the TI website

    -Andrew M
     
  4. You can parallel opamp voltage followers to reduce the total noise
    floor, but I've never seen it done for higher output drive or any other
    purpose. Just use a suitably rated opamp for driving the load required,
    there are plenty of ones designed for driving 50ohm loads and are
    stable into capacitive loads etc. Or if your drive needs are greater
    you would typically use an external tranisistor driver.

    Dave :)
     
  5. Mark Harriss

    Mark Harriss Guest


    It's mainly to reduce distortion into a given load, rather than
    increased drive capability. If you scroll down to the bottom of
    this page you can see what I'm after. The NE5532 gives good low
    distortion and I would like to minimise it as much as possible.

    Thanks
    Mark
     
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