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power hum

Discussion in 'Electronic Basics' started by Charles, Feb 25, 2005.

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  1. Charles

    Charles Guest

    Can anyone point me to a circuit for eliminating a 60 cycle power hum.
    I have a small transmitter connected to the audio output of my satellite
    decoder and want to connect a receiver to the aux input on my Hi-Fi. It
    works fine using a 3v battery supply but when connected to a commercial
    battery eliminator, there is an unacceptable background hum. I think a need
    a filter of sorts.

  2. The first thing to try is to connect a large value capacitor across
    the eliminator output to smooth the ripple the rectifiers produce. A
    capacitor of at least 1000 uF rated for at least 6.3 volts should
    help. Make sure you connect the positive end of the capacitor to the
    more positive side of the supply.
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