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Question about Capacitors

Discussion in 'General Electronics Discussion' started by john2k, Jun 26, 2012.

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  1. john2k


    Jun 13, 2012
    Is a 22uF capacitor the same as a 0.22uF capacitor? reason I ask is that I am getting capacitors for my 12v regulator, and the datasheet for the regulator says I need 22uF on the output and 0.47uF on the input. But when buying the capacitors, i noticed some suppliers list as 0.22uF and some list as 22uF. Am i missing something?
  2. john2k


    Jun 13, 2012
    sorry i think i've found the answer. it seems i do need a 22uF for the output because 22uF is higher than 0.22uF as 0.22uF will equal 220nF.

    just a quick question though:

    for the input of my regulator which the datasheet says i need 0.47uF for, what kind of capacitor would be best option? Metallised Polyester , Metallised Polypropylene, Tantalum Bead or Radial Electrolytic? for the output i've used a radial electrolytic 22uF one.
    Last edited: Jun 26, 2012
  3. MrEE


    Apr 13, 2012
    I'd use a 0.47uF to 2.2uF electrolytic AND a 0.01 uF Ceramic caps in parallel. I assume you are building just one regulator circuit. The caps should be rated at twice the maximum voltage you intend to use. This combination of two caps gives you a better filtering over a wider frequency range. Also on the output I'd put a 0.01 to 0.1uF ceramic cap if you have the room.
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    22uF is 100 times larger than 0.22 uF.

    Go by what the datasheet says (22uF sounds low, it may be the minimum)
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