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Discussion in 'Electronic Basics' started by Earl, Jan 18, 2004.

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  1. Earl

    Earl Guest

    Hello everyone
    Can someone help with the ba301 audio pre-amplifier, I need to
    understand the connections. I have a sound meter diagram

    I can guess some of the connections, e.g. power and gnd are
    obviously 7 & 4, 2 seems to be the input and 6 the output,
    but what are 1,3,4, &5. Is there a replacement chip for this
    obsolete IC. What is the amplification of this IC, and can I
    just use a simple op-amp instead ?
    shows several places that list the BA301.

    NTE 1135 is a replacement. You can get their datasheet at:

    We now return you to our normally scheduled programming.

    Take a look at this little cutie! ;-)

    Michael A. Terrell
    Central Florida
  3. Beale

    Beale Guest

  4. More than likely the NTE is a re-labeled BA301. NTE simply buys a
    quantity of a comon part and has their part number put on it for repair
    use. Their data is the same as the vendor they bought the part from.
  6. fred

    fred Guest

    Any ideas why we have a 120k resistor between pins 2 & 5
    in the sound meter ? I understand that pin 5 is "bypass"
    but what exactly does it mean, there are no examples how
    to use it?
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