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12v to 5v DC-DC converter hum

Discussion in 'General Electronics Discussion' started by codestaxx, Jun 20, 2015.

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  1. codestaxx

    codestaxx

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    Jun 20, 2015
    Please forgive as I'm just getting back into electronics after a 13 year hiatus. I recently installed a 12v to 5v DC-DC converter from amazon http://www.amazon.com/RioRand-Conve...5W+Power+Supply+for+Car+Vehicle+with+MINI+USB

    I installed this dc-dc converter into my 07 HD Road King Classic to power a Miccus Mini-jack RX (bluetooth receiver) using 12v (switched) from my accessory plug under my seat.
    http://www.amazon.com/gp/product/B0038MA11U?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00

    When I power on the device I receive a hum over my speakers. If I run the Miccus off of the internal battery- no hum. I tried various grounds, including the chassis ground bolts and straight to the battery to get rid of the hum. I initially thought it was a difference in the ground potential but obviously that's not the case.

    Is there something I can add to the circuit that would get rid of that noise?
     
  2. davenn

    davenn Moderator

    13,553
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    Sep 5, 2009
  3. cjdelphi

    cjdelphi

    1,096
    104
    Oct 26, 2011
    A ground loop isolator sounds like a fix (or a crap load of capacitance to filter out the switching going on)
     
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