Connect with us

Need line driver to 100 KHz

Discussion in 'General Electronics' started by Earl, May 13, 2004.

  1. Earl

    Earl Guest

    Hi Folks,

    I need to drive a .004 mfd total capacitance line from 30 to 100 KHz. The
    application is composite stereo to an FM transmitter, so I need flat
    response upwards of 100 KHz, and good phase response. The cable is Belden
    1800, 110 Ohms, I think, tho that probably doesn't apply much in these low
    freqs. It's around 130 feet. It's actually two-cond shielded, though this
    is unbalanced. Noise doesn't seem to be a problem. The signal level is
    about 4V P-P.

    I've tried an NE5532 op-ampwith some series resistance in the output, but
    get a lot of hash around 1 Mhz. Non-inverting configuration -- unity gain.

    What's a good chip for this app?
     
  2. Robert Baer

    Robert Baer Guest

    I bet that "hash" is one or more local radio station.
    If the level is well within the capabilities of the op-amp, then you
    should see if the drive is OK or not.
    Add some RC filteringto decrease that "hash".
    Use an LH0002 current buffer (inside the loop) for extra current drive
    capabilities.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-