OK to use a mylar instead of electrolytic?

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  • berniedd
    Senior Member
    • Mar 2007
    • 119
    #1

    OK to use a mylar instead of electrolytic?

    The P3 computer began to have random reboots and a screeching sound was noted from the "Epraizer" PSU. No bulging caps on the Asus mobo, so I put in another, new PSU. Problem solved. Now I'm trying to recondition the Epraizer. No bulging caps or overheated/dimpled power ICs. I want to replace the suspect capacitors, but I did see a 0.22 uf/50v and a 1 uf/50 v electrolytic. Can I just replace these with mylar or ceramic ones of the same ratings? I already have these in stock in my parts bin. Besides, new electrolytics will eventually dry out again.

    Also, can I safely replace 1000uf/10 v cap with 1000uf/6.3v that's also in my parts bin?

    BTW the thing's populated with Fuhjyyu's, Teapo's and Su'scons!
    Last edited by berniedd; 05-12-2009, 10:08 AM.
    Tags: None
    • Per Hansson
      Super Moderator
      • Jul 2005
      • 5895
      • Sweden
      #2
      Re: OK to use a mylar instead of electrolytic?

      1000uf/10v cap with 1000uf/6.3v is ok, only 3.3v 5v and 12v is seen on the secondary side

      The small electrolytics I am not sure about, they are very important on many powersupplies (having them fail shorted will result in the primary side going poof oftenly...)
      Wait for someone else to chime in on those...
      "The one who says it cannot be done should never interrupt the one who is doing it."

        Comment

        • Toasty
          Badcaps Legend
          • Jul 2007
          • 4171
          #3
          Re: OK to use a mylar instead of electrolytic?

          Many caps fail without bulging. All of those mentioned brands are crap. You're going to end up re-capping that entire supply. Is that cost-effective for a P3 supply?

          You can not replace electrolytics with mylar or ceramic. The circuit is designed to use the characteristics of a specific type of cap. You -may- be able to use a mylar or ceramic interchangeably, but not with electrolytics.

          Toast
          veritas odium parit

            Comment

            • PCBONEZ
              Grumpy Old Fart
              • Aug 2005
              • 10661
              • USA
              #4
              Re: OK to use a mylar instead of electrolytic?

              Get rid of the Fuhjyyu and Su'scon.
              If any Teapo are bad replace all the Teapo too.
              Mann-Made Global Warming.
              - We should be more concerned about the Intellectual Climate.
              -
              Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
              - Dr Seuss
              -
              You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
              -

                Comment

                • berniedd
                  Senior Member
                  • Mar 2007
                  • 119
                  #5
                  Re: OK to use a mylar instead of electrolytic?

                  Yeah, maybe it's not really cost effective to take out all them caps, but the real reason I do it is for my own self-satisfaction and pride, that I've resurrected trash stuff and turned them into useful gear again.

                    Comment

                    • berniedd
                      Senior Member
                      • Mar 2007
                      • 119
                      #6
                      Re: OK to use a mylar instead of electrolytic?

                      I replaced all caps 470 uf and above with new Samxons GF series. This PSU is now back in service, no more reboots nor screeching sounds are observed.

                        Comment

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