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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.

  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:
  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?

  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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