Using a 33uF 160V cap instead of a 22uF 160V?

Discussion in 'General Electronics Chat' started by Nicholas, Aug 22, 2008.

  1. Nicholas

    Thread Starter AAC Fanatic!

    Mar 24, 2005
    121
    1
    Hey all!

    I just wanted to know if there's some special rule or something regarding
    this. I have a monitor board with a bulging capacitor 22uF 160V...and the
    only cap I have right here to replace it with is a 33uF 160V. Is that ok,
    or is it bad?

    Thanks again!

    Nicholas
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    It depends on what part of the schematic it is used.
    If some timing is dependend on it you can not replace it by the larger one.
    If it is over the powerlines it will work.

    Greetings,
    Bertus
     
  3. dogstail

    Member

    May 8, 2008
    10
    0
    what does the circuit do?
     
  4. Nicholas

    Thread Starter AAC Fanatic!

    Mar 24, 2005
    121
    1
    Well, it's just a singleboard chassis (and neckboard)

    I wouldn't have the slightest idea what the cap does:)

    Here's a picture of the present cap(to the right)
    [​IMG]

    If timing gets off, would that only be something like image-problems on the CRT?
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The function of the cap is possibly a filter for DC ripple. If that is the case, then the larger capacity won't hurt.

    The old one is going to let it's insides bow out very soon. Observe the polarity, substitute the larger cap in, and see if all is well. It's not likely to cause harm.

    Note - if the cap filters the output of a SMPS, it should be a low ESR type. It could get hot and fail otherwise. At least you won't be any worse off.
     
    Last edited: Aug 22, 2008
  6. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    If you replace the capacitor with a bigger one the current spikes will be larger and may destroy the bridge rectifier or other parts of the circuit.
     
  7. Nicholas

    Thread Starter AAC Fanatic!

    Mar 24, 2005
    121
    1
    Well, I can see that it's a risk. I'll do it!!!!!

    :)
     
  8. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The capacitor looks as old as me and I am an old geezer.
    Electrolytic capacitors are inexpensive. Replace them all.

    The product looks inexpensive. Replace it with a new one.
     
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