capacitor stock for repair shop

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • koby058
    Badcaps Veteran
    • Jan 2017
    • 375
    • israel
    #1

    capacitor stock for repair shop

    Hi

    I have ordered a set of ceramic caps from a..express and when i measure a 10uf cap the multi meter showed 8uf, I guess those are shitty caps.

    Can you recommend where to buy high quality caps and fuses
    ali is preferred if possible
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14106
      • Canada
      #2
      Re: capacitor stock for repair shop

      The capacitance is only an approximate value. Some parts have different tolerance than others. Factors such as the quality of your meter will play a role in the final measurement.

      Guessing that the parts you have are 20% tolerance.

      Parts do derate based on their physical size and the actual voltage for which is used in the circuit compared to the rated voltage.

      Read this eye opener of an article:

      https://www.maximintegrated.com/en/d...ls/5/5527.html

        Comment

        • piernov
          Super Moderator
          • Jan 2016
          • 4435
          • France
          #3
          Re: capacitor stock for repair shop

          Indeed capacitors are generally 20% tolerance, and capacitance measurement in a DMM is not necessarily very accurate. However if they are very close to the 20% tolerance bounds (so very close or below 8uF), they may be "refurbished" old capacitors that have aged already. In general it's not a problem, but if you want a reliable supply of parts, don't use Aliexpress, buy from a local electronics distributor.
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

            Comment

            Previous template Next

            Related Topics

            Collapse
            • Prolog
              RTX 3080 FE Identifying capacitor
              by Prolog
              Hi people, I hope this is the correct spot to post this, I'm new to the forum.

              I have an RTX 3080 Founders Edition which has a burnt up capacitor (it was in parallel with another capacitor which appears damaged too), so I am hoping to be able to identify the capacitor values and order replacements.

              I hope these photos make it clear which component I am referring to:
              (yes, the soldering is a bit botched from removing the blown one, I know)

              I have found the board schematic (attached), but there does not seem to be a boardview available. I have never...
              12-01-2024, 08:27 PM
            • chth96
              If I replace with inferior capacitor, Is it No harm to other IC components at all?
              by chth96
              I replaced some capacitor which is located on optical pickup pcb which is shown in the table below(PCB #2).Because it have been out of order.
              Now,It works very well,But I just have found that all caps (6svpc100my and other part number as well) ,which is shown in the table below, has ultra-high ripple current spec.
              It is not able to obtain any capacitor which can be a substitute for this ultra-high ripple current nichicon capacitor.
              So I replaced it with samxon and rubycon's general capacitor(GP,YXA series).
              I know that these capacitor will not last as long as nichicon capacitor...
              12-22-2023, 04:34 AM
            • chth96
              How can I test non-polarized capacitor?
              by chth96
              I desoldered samwha NF capacitor(50v 5.6uf) from PCB circuit of 29inch CRT TV which have symptoms of no display after I heard sound of inrush of current to TV whenever I switch on this television.
              I measured ESR value of this non-polarized capacitor(samwha NF capacitor 50v 5.6uf) by means of MESR-100 ESR meter and It displayed 0.3 ohm

              And When I measured its capacitance with digital multimeter and LCR-T4 Mega328 meter, It displayed 10uf from DMM and 8uf from LCR-T4 meter.
              I found catalogue of samwha capacitor(samwha-catalogue_3.pdf file), which is attached to this thread,...
              06-02-2024, 07:31 PM
            • chth96
              Should I replace polymer capacitor?
              by chth96
              a few days ago I finally purchased mser-100 v2 and I tested its abillity of measuring ESR value.
              I found that It shows pretty accurate ESR value for electrolytic capacitor,But When I measure polymer capacitor of dreamcast game console,I found that one third of polymer capacitor's ESR value is more than twice the value of ESR meter table.(for example, I measured one polymer capacitor of 6.3v 100uf, It showed ESR value of 7.68)
              Although my dreamcast now turns 20 years old but it still works. I occasionally have played game with it.
              Is this ESR value of polymer capacitor correct?...
              11-18-2022, 04:22 AM
            • NuclearSpartan
              Samsung C32HG70 - Blown Ceramic Capacitor (CP813)
              by NuclearSpartan
              Hi everyone,

              I'm new to this, so I apologize for not providing enough details. Is there anything else I need to mention? I'm trying to learn more about electronic/board repairs and hopefully fix my own.

              The only visible issue on my board is one capacitor, CP813, which appears to be labeled R 221k 2kV (possibly obsolete to B 221k 2kV now). My monitor hadn't shown any prior issues, although it is a few years old. Just before the capacitor popped, there was a high-pitched squeal for 2–3 seconds.

              I don't see any other visible damage anywhere else on the board....
              Board side A
              3 Photos
              11-14-2024, 02:32 PM
            • Loading...
            • No more items.
            Working...