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Electrolytic capacitor in timing use?

Discussion in 'General Electronics Discussion' started by eem2am, Feb 5, 2014.

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  1. eem2am

    eem2am

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    Aug 3, 2009
    Hello,
    C8, in the following schematic , is a 10uF electrolytic capacitor. It is rated 16V.
    As you can see, it is across the Base-emitter of a BJT, thus it never gets any more than 0.7V across it.
    Do you believe that this should be a ceramic capacitor instead?
     

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  2. duke37

    duke37

    5,273
    733
    Jan 9, 2011
    I do not see an electrolytic capacitor of any value across a base/emitter junction.
    C3 is 1nF
    C7 is 10nF
    There is no 10µF
    These can be plastic film types. (polyester ot polypropylene)
     
  3. Arouse1973

    Arouse1973 Adam

    5,164
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    Dec 18, 2013
    C8 across Q5 is 10uF is it not?
     
  4. davenn

    davenn Moderator

    13,424
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    Sep 5, 2009
    agreed :)

    eem2am, why are you particularly worried about that transistor and cap ?
    more than half of the transistors have electros across the base and emitter


    Dave
     
  5. davenn

    davenn Moderator

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    Sep 5, 2009
    is this going to be another one of your wild goose chases ?



    Dave
     
    Last edited: Feb 5, 2014
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,269
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    Jan 21, 2010
    I would tend to recommend waxed paper capacitors for anything under maybe 0.5 uF.

    Ask your boss about the possibilities...
     
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,269
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    Jan 21, 2010
    Hang on a second. Didn't I ask you to stop posting about this until you answered my questions.

    Thread closed, and holiday awarded.
     
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