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Capacitors

Discussion in 'General CB Services Discussion' started by Superidgit, Jun 18, 2011.

  1. Superidgit

    Superidgit Active Member

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    I can not recall where I read this. However I read somewhere that replacing the electrolytic capacitors inside a radio from a 12v to 16v would help do something.

    My questions are these:

    The radio lets say a cobra 25/29



    What would this modification actually do?

    Is it even worth it?

    What problems could one see if this mod was done? ( I know if done incorrectly, I could have a capacitor sticking out of my ear.)

    Also, could this mod be done to any radio?
     

  2. AudioShockwav

    AudioShockwav Extraterrestrial Admin
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    If it is a real old radio they tend to dry out over time and can fail.....if you are going to re-cap a old radio, it is a good idea to go to the higher voltage cap`s.
    It simply gives the replacement part more headroom in breakdown voltage....


    73
    Jeff
     
  3. Superidgit

    Superidgit Active Member

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    so nothing important about going 12v to 16v?
     
  4. TonyV225

    TonyV225 W9WDX Amateur Radio Club Member

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    No just a reliable upgrade. There are klits that are sold for replacing caps in the older tube amplifier on the net aswell its just a good idea and feeling knowing there all upgraded and new.
     
  5. Superidgit

    Superidgit Active Member

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    man i woulda thought something grand!! :unsure:


    so wouldnt even help with cruising down the road and seeing yer radio lights flicker?


    See thats why ya gotta ask yer questions here!!:w00t:
     
  6. dudmuck

    dudmuck Active Member

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    Any capacitor directly exposed to vehicle voltage should be at least 16v.
    Probably (hopefully!) those 12v caps are not used for that.

    good design practice actually says a capacitor should have double the voltage rating of what its actually going to see in service.

    More important is what the capacitor is used for. DC block, or bypass, or ceramic caps are often for RF tuning.
    Its important to know what kind of frequencies its exposed to, and that those dont approach the self-resonance of the capacitor. Usually capacitors are useless when getting near or above self-resonance.

    ESR and Bypass Cap Self-Resonant Behavior
     

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