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Need line driver to 100 KHz

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

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  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
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