just got a pump.. a bit confused

Discussion in 'General Electronics Chat' started by AXmichigan, Aug 7, 2009.

  1. AXmichigan

    Thread Starter Member

    Jun 17, 2009
    11
    0
    hey guys
    so i just bought these pumps from china for this project i am working on
    i found them initially because i opened a bp cuff and saw them in
    (http://wwwe.koge.com/index_down.php?openCatIDfor3=1&openCatID=1&CAhs=defuse&firestpageset=1&ISPID=6&IIBig=1&sele=shopbig_dm_down&searchname=)

    the pumps they sent are just with empty nodes to solder on which is fine
    but i was wondering, because the pumps in the bp cuffs have a capacitor between the power & ground
    why did they do that?
    and what capacitor size should i use, does it matter?

    i ask because the pump worked before, and now is seeming to be shorting my project when connected
    is this part of the problem?

    thanks!
     
  2. John5788

    Active Member

    Apr 2, 2009
    54
    0
    sounds like a decoupling capacitor used to reduce noise
     
  3. AXmichigan

    Thread Starter Member

    Jun 17, 2009
    11
    0
    thanks john!

    just a lil project :)
     
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