Types of electrolytic caps

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Askic
    Senior Member
    • Sep 2018
    • 187
    • BIH
    #1

    Types of electrolytic caps

    Hello guys,

    can you explain me what type of caps is the one shown in the attached picture. Is is different from so called classical one. I have taken a photo of these caps next to each other. The data written on the cap is 22 uF, 50V, PH, 116, H1 KO H1.

    On many motherboards there are different types of electrolytic caps. These look more robust (probably aluminium capacitor).

    Do they have some special purpose?
    I have one 22 uF, 50V so called robust cap and other "classical", the same capacity and 63V, but smaller dimensions.
    Attached Files
    Tags: None
    • Per Hansson
      Super Moderator
      • Jul 2005
      • 5895
      • Sweden
      #2
      Re: Types of electrolytic caps

      At first I thought your cap was very similar to this one I posted about here:
      https://www.badcaps.net/forum/showthread.php?p=257252

      I may be wrong though, and if so it is probably a solid polymer aluminium capacitor.
      Basically they do not have any wet electrolyte and hence have much higher rated ripple current and a much longer life.
      This thread has a bit explanation about it, but I am sure others can point you to better resources here on Badcaps.
      https://www.badcaps.net/forum/showthread.php?t=65732
      "The one who says it cannot be done should never interrupt the one who is doing it."

        Comment

        • Askic
          Senior Member
          • Sep 2018
          • 187
          • BIH
          #3
          Re: Types of electrolytic caps

          Originally posted by Per Hansson
          At first I thought your cap was very similar to this one I posted about here:
          https://www.badcaps.net/forum/showthread.php?p=257252

          I may be wrong though, and if so it is probably a solid polymer aluminium capacitor.
          Basically they do not have any wet electrolyte and hence have much higher rated ripple current and a much longer life.
          This thread has a bit explanation about it, but I am sure others can point you to better resources here on Badcaps.
          https://www.badcaps.net/forum/showthread.php?t=65732
          Thank you Per, based on your suggested keywords, I was able to find a very good explanation:
          https://www.gigabyte.com/microsite/1...hyusesolid.htm
          This motherboard manufacturer has so called "ultra durable" motherboards with this type of caps.

          My dilemma is whether to replace solid aluminium cap with a classical one. I have an electronics card about 20 years old (PLC input card) which works most of the time but suddenly stop behaving as expected. After Power OFF/ON it works for another period of time. I was thinking to try to preventively replace the caps.

            Comment

            • Per Hansson
              Super Moderator
              • Jul 2005
              • 5895
              • Sweden
              #4
              Re: Types of electrolytic caps

              In that case I think my first link above might be correct.
              I.e. that a Rubycon ZL or similar would be a good replacement.
              "The one who says it cannot be done should never interrupt the one who is doing it."

                Comment

                • Askic
                  Senior Member
                  • Sep 2018
                  • 187
                  • BIH
                  #5
                  Re: Types of electrolytic caps

                  Originally posted by Per Hansson
                  In that case I think my first link above might be correct.
                  I.e. that a Rubycon ZL or similar would be a good replacement.
                  Thank you very much Per. I know this is not related to the discussed subject, but can you tell me what exactly is the PSU's "startup cap", you put it yourself under quote marks in the following link: https://www.badcaps.net/forum/showthread.php?p=257252
                  Last edited by Askic; 12-09-2020, 02:44 AM.

                    Comment

                    • Per Hansson
                      Super Moderator
                      • Jul 2005
                      • 5895
                      • Sweden
                      #6
                      Re: Types of electrolytic caps

                      It is a small capacitor that is usually on the primary side of the power supply.
                      It controls the startup of the power supply, and if this capacitor goes bad the PSU will appear completely dead.
                      Not all power supplies have a startup capacitor, it is a kind of old design practice.
                      Usually you can identify it it is the problem by heating the power supply up:
                      If it starts after that it is likely to be a bad startup capacitor, see here for an example of that:
                      https://www.badcaps.net/forum/showth...875#post114875
                      "The one who says it cannot be done should never interrupt the one who is doing it."

                        Comment

                        • PeteS in CA
                          Badcaps Legend
                          • Aug 2005
                          • 3581
                          • USA, Unsure of Planet
                          #7
                          Re: Types of electrolytic caps

                          Originally posted by Askic
                          Thank you very much Per. I know this is not related to the discussed subject, but can you tell me what exactly is the PSU's "startup cap", you put it yourself under quote marks in the following link: https://www.badcaps.net/forum/showthread.php?p=257252
                          In a 384x design it would be something like C2 in this schematic:



                          When AC is first turned on, C2 is charged through R2 until the voltage is high enough for IC1 to turn on. Once turned on, IC1 receives its Vcc through D2 and D1. However, if C2 is high ESR, the energy drawn by IC1 lowers the voltage at Vcc and the under-voltage protection in IC1 shuts down IC1.

                          In that circuit both C2 and C4 are stressed and need to be high quality parts such as Nichicon PW series or UCC/NCC LXZ series.
                          PeteS in CA

                          Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
                          ****************************
                          To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
                          ****************************

                            Comment

                            • Askic
                              Senior Member
                              • Sep 2018
                              • 187
                              • BIH
                              #8
                              Re: Types of electrolytic caps

                              Excellent explanation Petes, thank you and also Per for your time and effort.

                                Comment

                                Previous template Next

                                Related Topics

                                Collapse
                                • momaka
                                  Seasonic B12 BC-550 – barely 2 years old and with BAD CAPS already!
                                  by momaka
                                  I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.

                                  For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).

                                  https://www.badcaps.net/filedata/fetch?id=3591771


                                  https://www.badcaps.net/filedata/fetch?id=3591772

                                  It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:

                                  https://www.badcaps.net/filedata/fetch?id=359177...
                                  03-12-2025, 03:42 PM
                                • tony359
                                  Best tool to place electrolytic SMD caps on a board
                                  by tony359
                                  HI all,

                                  I am working on some boards where all 100+ SMD caps have to be replaced (yes, they actually went bad!). I found a workflow to remove them comfortably (two irons, pre-heater and extra hot air for larger ones on ground planes).
                                  When it comes to soldering them back, I add solder to one pad and then I use a plastic tweezer to keep them in the right place while I solder that leg.

                                  The tweezer works - but I was wondering if there is a more "dedicated" tool or whether someone has a better idea. If it was for a bunch of caps then who cares. But because...
                                  01-28-2024, 06:23 AM
                                • Paxman_Swede
                                  Identifying caps on an old Zoom 9000
                                  by Paxman_Swede
                                  Hello!

                                  I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.

                                  The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.

                                  I have studied the board and...
                                  01-14-2025, 09:51 AM
                                • captain150
                                  Help with switching power supply caps
                                  by captain150
                                  I'm trying to repair two old VCRs, they both have bad caps. One has leaky ones, the other would barely run until I subbed in some caps from another power supply I had laying around (though they are the wrong values). This vcr works for an hour or two, but then the power supply starts whining and the picture gets lines in it. I didn't replace all the secondary caps, so another voltage might still be problematic, or the values I used are too far off.
                                  I've been on mouser and digikey but the options are a bit overwhelming. I just need some new ones that will work. They don't need to be top quality,...
                                  03-16-2025, 07:34 PM
                                • Foetuss
                                  Gigabyte GA-6OXT :: caps question
                                  by Foetuss
                                  Good evening

                                  I recently aquired a rev 1.1 Gigabyte 60XT, and was suprised of the amount of leaking caps for a motherboard of the P3 era. Especially the way the 330µf caps seems like the housing discolored even.
                                  Now, there are some 3300µF 6.3V KZG series around the CPU. Would it be OK to replace them with something like EEUFR1A332 ? (Panasonic FR 3300µF 10V). Or was this board designed around very low ESR caps?

                                  But I was also suprised about the bigger boys, which are 330µF 25V.
                                  Could it be they used 25V caps because they were cheaper / available at that time?...
                                  02-11-2025, 12:22 PM
                                • Loading...
                                • No more items.
                                Working...