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Questions n, n+1, and n+2 from my homework

Discussion in 'Electronics Homework Help' started by ans, Nov 30, 2010.

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  1. ans

    ans

    19
    0
    Nov 25, 2010
    Is it possible to determine the frequency of a device without using oscilloscope?

    Is snubber circuit a right choice to protect the circuit from circuit breaking.

    capacitor is placed in fan it is a necessary component can any one explain how it works?
     
    Last edited by a moderator: Nov 30, 2010
  2. rob_croxford

    rob_croxford

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    Aug 3, 2010
    google will tell you these answers...

    Capacitor in Fan?? are you sure this is not meant to be a diode accross the fan??
     
  3. davenn

    davenn Moderator

    13,648
    1,884
    Sep 5, 2009
    maybe its a suppression cap across an AC fan ?

    Dave
     
  4. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    Could your fan motor be one of those single-phase capacitor-start induction motors? Or one of those permanent-split capacitor (PSC) motors without a centrifugal switch, such as are often used in air movers and ceiling fans? My 220 volt pool pump motor seems to be a PSC motor.
     
  5. LTX71CM

    LTX71CM

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    May 23, 2010
    Laplace I don't think we'll ever know, he's been banned.
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,411
    2,779
    Jan 21, 2010
    He's only been banned for 3 days until he takes the time to read the message I sent to him asking him to:

    a) post in the right area
    and
    b) read the faq for homework help.

    Having said that, if in 3 days time he does not improve, I might reconsider.
     
  7. lexroxas

    lexroxas

    37
    0
    Apr 15, 2011
    Old query.

    A) Is it possible to determine the frequency of a device without using oscilloscope?
    B) Is snubber circuit a right choice to protect the circuit from circuit breaking.
    C) capacitor is placed in fan it is a necessary component can any one explain how it works?

    +++++++

    A. It depends, if you are referring to a specific device like a 555 timer the you'll be able to get its frequency without using an oscilloscope. The computed value is an approximation of the actual using an oscilloscope. If you will ask why it's not exact then you'll have to ask Steve about leakage current and tolerance of components.

    B) It depends on the circuit you are trying to protect. Other than a snubber, you may consider using a varistor.

    C) A fan is basically an inductor. When power is removed, the inductor's current will start to decay very fast and will produce very high voltage spike that will most likely destroy the wire laminations of the coil's wire and short-circuit itself. A capacitor cannot charge instantaneoulsy, so if you place it in parallel to the coil you will have control over the voltage spikes. It's a simple and straight-forward method of protection but it there are some other methods of choice.
     
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