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Using a radial cap instead of an axial one - shielding needed?

Discussion in 'Troubleshooting and Repair' started by soul73, Jul 16, 2019.

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  1. soul73

    soul73

    17
    2
    Oct 27, 2016
    Hey guys,
    I am recapping a tube processor which uses a few 100 uF/25V axial caps. I´d like to use a Panasonic FM radial cap and mount it as seen in the attached picture.

    Do you think I have to shield the long leg? What would be the best option? Conductive paint? Shielding shrink tube?

    Thanks,
    Eno
     

    Attached Files:

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,257
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    Jan 21, 2010
    These are probably filter capacitors, and no shielding is required. If the capacitors were in the signal path, your best option would be to use the shortest lead length on the higher impedance side and route the lead to the lower impedance side as best you can.

    It may be better to keep the leads as close as possible to the board if there's a ground plane. That doesn't appear to be the case here.

    An overall shorter lead length could have been obtained by mounting the cap vertically.
     
    soul73 likes this.
  3. soul73

    soul73

    17
    2
    Oct 27, 2016
    Hey Steve, thank you so much for your reply!

    I should be able to mount them vertically if that is preferable.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,257
    2,705
    Jan 21, 2010
    You will need to be careful if there is anything under the caps that the leads could short to, but you can always slip some insulation over the leads.
     
    soul73 likes this.
  5. duke37

    duke37

    5,268
    728
    Jan 9, 2011
    Depending on the circuit, I would connect the long lead to the earthy potential. The picture shows the long lead connected to + which may have AC on it.
     
    soul73 likes this.
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