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Disadvantage of several capacitors in parallel in a power supply?

Discussion in 'Power Electronics' started by MrOmnos, Nov 5, 2015.

  1. MrOmnos

    MrOmnos

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    Jun 4, 2014
    Hi! I am making a linear power supply. I don't have 10,000 μF cap but I have several 1000 μF caps. So, I thought I could add 10 of them in parallel to get 10, 000μF value. Will this cause any problem. This power supply is just for displaying in my class giving some basic demonstration like running a 5v fan ans stuff like that.
     
  2. AnalogKid

    AnalogKid

    2,307
    649
    Jun 10, 2015
    10,000 uF is awfully big for running a 5 V fan, but as long as the minimum voltage rating among the caps is greater than the peak voltage across them, no problem. And there is no problem with the caps being different values.

    ak
     
  3. Minder

    Minder

    2,871
    594
    Apr 24, 2015
    Also there are many loads where any filter or cap is not required at all when full wave rectification is used , loads such as lights, and many inductive loads such as relays, solenoids, motors etc.
    M.
     
  4. davenn

    davenn Moderator

    13,328
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    Sep 5, 2009
    and what sort of stuff like that ?

    what is the max current rating of the power supply
    you can work of the rule of thumb of using 1000uF per amp
    so if it is only say, a 3 A max PSU, you only need a max of 3000uF ( 3300uF is the closest value)


    Dave
     
  5. davenn

    davenn Moderator

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    Sep 5, 2009
    True,
    but since we don't know what is included in "stuff like that" its best to have smoothing.
    As they may end up using it to power any ol sort of electronics where smoothing is needed

    Dave
     
  6. Minder

    Minder

    2,871
    594
    Apr 24, 2015
    My intention was not to change his mind, just inform him of some options or conditions.
    M.
     
    davenn likes this.
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