Polymer bulk cap in an Atari 2600?

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  • jayjr1105
    Badcaps Veteran
    • Jan 2018
    • 281
    • United States

    #1

    Polymer bulk cap in an Atari 2600?

    Scored a Vader 2600 in pretty good condition. I'm going to do all the recommended cap replacements all around and have a kit from console5.com on the way including a 5v regulator. I just remembered I have some 2200uf 16v Kemet Polymer caps that are very small and should be able to mount vertically. I'm considering using it as long as the polymer won't cause problems where an electrolytic axial one was before. Is this okay to do?
    Attached Files
    --------------------------------------------------------------
    Ryzen 3600x
    16GB Patriot 3600MHz
    MSI B450 Gaming Plus
    MSI Air Boost Vega 56
    Acer 32" 1440P Freesync
    Rosewill Capstone 750W
    --------------------------------------------------------------
    Hakko FX-888D Station
    FX-8802 Iron
    MG Chem .8mm 63/37 RA 2.2%
  • petehall347
    Badcaps Legend
    • Jan 2015
    • 4426
    • United Kingdom

    #2
    Re: Polymer bulk cap in an Atari 2600?

    polymer is electrolytic

    Comment

    • redwire
      Badcaps Legend
      • Dec 2010
      • 3906
      • Canada

      #3
      Re: Polymer bulk cap in an Atari 2600?

      Oriiginal is a linear power supply, 9VDC 500mA wall wart feeding 2,200uF 16V axial 7805 voltage regulator.
      IMHO a polymer cap is overkill ESR=10mohm and not needed for the mains frequency ripple. The 7805 isn't affected by the low ESR, so it's OK to put one in if you want. Power switch on surge will be big and sometimes that causes destructive spikes.
      Mains sags would make the game crash sometimes. But the (original linear) wall wart also has a big filter cap inside. Without that, I would upsize the 2,200uF cap to whatever fits. Coleco had 10,000uF in their psu.
      I'm not sure if people are using SMPS wall adapters with 2600 and their tons of RF noise.

      Comment

      • jayjr1105
        Badcaps Veteran
        • Jan 2018
        • 281
        • United States

        #4
        Re: Polymer bulk cap in an Atari 2600?

        Originally posted by redwire
        Oriiginal is a linear power supply, 9VDC 500mA wall wart feeding 2,200uF 16V axial 7805 voltage regulator.
        IMHO a polymer cap is overkill ESR=10mohm and not needed for the mains frequency ripple. The 7805 isn't affected by the low ESR, so it's OK to put one in if you want. Power switch on surge will be big and sometimes that causes destructive spikes.
        Mains sags would make the game crash sometimes. But the (original linear) wall wart also has a big filter cap inside. Without that, I would upsize the 2,200uF cap to whatever fits. Coleco had 10,000uF in their psu.
        I'm not sure if people are using SMPS wall adapters with 2600 and their tons of RF noise.
        Yes I figured polymer and even name brand wet electrolytics would be overkill in this use case but just wanted to make sure there would be no adverse affects from using a capacitor of different chemistry. Since you say raising the capacitance would be a good thing. the 2200uf 16v poly's I have are so small, I might mount them upright traditional through hole style and bodge in the wires underneath the board so they're parallel.
        --------------------------------------------------------------
        Ryzen 3600x
        16GB Patriot 3600MHz
        MSI B450 Gaming Plus
        MSI Air Boost Vega 56
        Acer 32" 1440P Freesync
        Rosewill Capstone 750W
        --------------------------------------------------------------
        Hakko FX-888D Station
        FX-8802 Iron
        MG Chem .8mm 63/37 RA 2.2%

        Comment

        • jayjr1105
          Badcaps Veteran
          • Jan 2018
          • 281
          • United States

          #5
          Re: Polymer bulk cap in an Atari 2600?

          It's a bodge for sure but at least a clean one.
          Attached Files
          --------------------------------------------------------------
          Ryzen 3600x
          16GB Patriot 3600MHz
          MSI B450 Gaming Plus
          MSI Air Boost Vega 56
          Acer 32" 1440P Freesync
          Rosewill Capstone 750W
          --------------------------------------------------------------
          Hakko FX-888D Station
          FX-8802 Iron
          MG Chem .8mm 63/37 RA 2.2%

          Comment

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