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Off the shelf amplifier modules

Discussion in 'Electronic Equipment' started by nospam, Dec 5, 2008.

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  1. nospam

    nospam Guest

    A customer has a customer who has a requirement to drive some equipment
    with a 50 ohm input from a generator that can't drive 50 ohms.

    I don't know what the generator is, probably DACs on a PC data acquisition
    type card.

    Frequency response requirement might be just dc, can't be more that a few
    10's of kHz or their generator would have decent outputs to start with.

    Maximum required output 0 to 10v dc into 50 ohms, gain unity or maybe x 2.

    Anyone know of anything off the shelf and moderately priced that would do
    this? Multiple channels might be a plus.

    TIA.
    --
     
  2. Joerg

    Joerg Guest

  3. nospam

    nospam Guest

    Well thanks for the pointer to something that would do the job although the
    form factor isn't quite what I imagined. I was thinking more along the
    lines of a little box with a wall wart or DIN rail mounted module taking
    24v dc supply not something that would need its own shelf to do 4 channels.
    I have since discovered the generator is a PC data acquisition card with a
    max output current of 5mA.

    Still haven't found anything, perhaps not an easy thing to search for but I
    didn't think the requirement was so obscure.

    Maybe I should be looking for audio amplifiers hoping to find something dc
    coupled with well defined gain?

    --
     
  4. CJT

    CJT Guest

    Most audio amplifiers will deliberately NOT pass DC, in order to avoid
    destroying speakers.

    Maybe something like this, with a few extra parts:

    http://www.jameco.com/webapp/wcs/st...ifiers&ddkey=http:ParametricSearchResultsView
     
  5. NS-

    What you describe sounds something like a servo amplifier or
    instrumentation amplifier. It is not obscure, its just not a consumer
    item! It might be available from the same place that produced the data
    acquisition card.

    If you want to build your own, what about using a power op amp?

    Fred
     
  6. Joerg

    Joerg Guest

    They usually all have well defined gain. You'd have to find one that can
    muscle the required swing into a 50ohm load without excessive distortion
    and with some margin, then hack it so it'll pass down to DC.
     
  7. JosephKK

    JosephKK Guest

    Perhaps a DC servo amplifier is close to what you want.
     
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