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Discussion in 'Electronic Design' started by Marius Kaizerman, Jul 18, 2004.

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  1. Hi,

    I've build the riaa preamp from here:
    and the dual power supply that feeds it from here:
    (I've used 7809 and 7909 instead of the 15v regulators)

    If I feed the preamp with two 9v batteries, all is ok.
    However, using the above power supply there's a
    strong hum noise.

    Anyone can help ?

  2. I read in that Marius Kaizerman
    If you have built the power supply correctly, there should not be any
    hum. Check the connections to the electrolytic caps, especially the
    polarities in the -9 V circuit. Positive to 0 V!
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