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Question about Capacitors

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

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  1. john2k

    john2k

    176
    2
    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

    john2k

    176
    2
    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

    MrEE

    84
    0
    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

    25,412
    2,780
    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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