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Thread: Cap or not to cap

  1. #61
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    I hope people aren't going to argue over this topic...I hate that

  2. #62
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    Quote Originally Posted by DracoPCGuy View Post
    I have a quickie to add here...Can anyone recommend a good place to get an alternator for a decent price...? I have looked around but I am just curious were you all get your stuff.
    http://www.powerbastards.com/categories.asp?cat=19

    And for ones with deep pockets,.....

    http://www.nationsstarteralternator....Kits-s/209.htm

    ......And rray is right, if you can get a decent alt from a bone yard that would save a lot of $$$


  3. #63
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    Quote Originally Posted by settra View Post

    THE IMPENDENCE OF INDUCTORS ICREASES AS FREQUENCY INCREASES (look at it. its there). god. you use the phrase " they lack basic electric knowledge" . and yet you do not know such basic staff like that? i do not misunderstand anything. i STUDY phisics. i know the proof for those formulae and how they work....
    Just as a capacitor filters out low range frequencies inductors can filter out high frequencies. One only needs to look at how passive crossovers work...

    You are correct but don't try to correct OldSpark with the facts... He won't listen... I won't waste my time...

    In a passive crossover we rate capacitors for the frequencies we want to filter out below. Any frequencies below that will be erased by the constant charging and discharging of the capacitor.

    An inductor is rated for filtering out high frequencies. The higher the frequency the harder it is to pass through.

    Since I don't recall the specifics I will leave that to others but if inductance didn't change with frequency you wouldn't be using inductors in passive crossovers... (Normally used to protect tweeters.)

  4. #64
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    deleted 25July13 20:00Z
    Last edited by OldSpark; 07-25-2013 at 05:11 AM.

  5. #65
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    no no oldSpark. it is not me that explained it. it is Wikipedia (since most people dont have a reason to trust my knowledge. but then again, they dont have to trust yours either. so we are left with wiki. right? )

    http://en.wikipedia.org/wiki/Loudspeaker
    can you explain better than wikipedia how speakers work? Electrical characteristics of dynamic loudspeakers : " however, a loudspeaker does not have a constant resistance across its frequency range "
    really it is not neccecery for me , that you beliave me, i trust that people reading this thread will know who is right.
    And how can you not get it? IMPENDENCE IS NOT THE SAME AS RESISTANCE (although they are both measured on Ohms).
    giving you the formula :

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    is tha same as giving you the formula :
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    The formula that says how resistance is depended on temperature (except ofc if OldSpark beliaves it dosent)

    it is formulas to determine just that. resistance or impendence. Ohms law is something diferent. just becouse its the only formula you know, dosent mean its the only one that exists.

    and furthermore OldSpark, have you EVER build an RLC filter? Becouse i have. if you had, you would know that , it is becouse of changes in impendece, with frequency that they work AT ALL. else how do you think they work? if you want, i can post you a detailed explanation on how they work, but SURELY.

    "And I further pity you when it comes designing for these new-age resistors and capacitors and coils. I remember how difficult it was using traditional calculus until complex calculus (integration & differentiation) came about - bless those cosh & sinh etc functions, not to mention i or j (the root of -1; or 90 degree rotator if you prefer polar).
    Of course the great savior was the frequency- aka time-domain (Laplace) transform whereby the varying time & frequency response was a simple case of the "linear" manipulation of R & sL & 1/sC"
    dont just blurp out scientific words, to make your point seem more valid, becouse to me , that i actually know what those terms mean, seems pretty funny...

    most of the staff you say , are un-scientific , and based on logical leaps or misunderstandings. try to explain a simple thing, based on your conclusions (like , how low pass fitlers work) and you will see that you cant.

  6. #66
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    Old spark... Really? Wow... If that really offended you then you need to turn off your computer and never turn it back on...

    Just telling settra there is no point in challenging you because you won't listen to reason and even if proven wrong you won't accept it and will still give misinformation. I have wasted too many hours trying to set you straight but you won't listen and you still spew the same misinformation. It is best to state a reasonable case, give references and move on. When I give personal examples that I have experienced, you discount them with no valid reason and try to explain how it isn't possible then ignore the response explaining the facts behind the story. So whats the point in challenging you if you are not willing to accept the fact you are not perfect? Enough said..

    Beyond that, talking about passive components is getting a bit off topic but passive crossovers are not perfect. Different characteristics of the sound waves will screw with passive components and they become more of a moving target. You can get reasonably close and it is a low cost solution but active components do a much better job and clean up the sound product much earlier in the process. If this wasn't the case we would never need digital cross overs or more than a 2 channel amp to run 2-4 way speaker setups. So with this ideal in mind you should never expect a capacitor to completely get rid of noise for much the same reason. At best it will greatly reduce it but some noise will still make it through. Same thing with inductors and high frequencies.

    Back to the OP and caps in the car.. As already stated, caps are a band-aid and should not be used in your vehicle for anything other than temporary use or testing purposes. With modern amplifiers and modern charging systems a capacitor is a complete waste. If a cap is hooked up properly and mounted properly then you shouldn't have issues with it but if you actually notice an improvement then you are noticing a symptom of something wrong in your system and need to figure out what it is and fix it.
    Last edited by redheadedrod; 07-24-2013 at 04:48 AM.

  7. #67
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    deleted 25July13 20:00Z
    Last edited by OldSpark; 07-25-2013 at 05:11 AM. Reason: PS...

  8. #68
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    dude. redheadedrod is so god damn right. IF, someone was to read your post, he would most propably get comfused, becouse you just hide behind words. No matter how complicated you decide to make it. the answer is right here :
    "A load like a speaker does not have varying impedance because of the varying voltage applied to it. " varaying voltage IS the meaning of AC. i would think you knew that. the mesure of how it varies is called FREQUENCY. ooooooooooooo??


    https://en.wikipedia.org/wiki/Loudspeaker
    http://en.wikipedia.org/wiki/Electrical_impedance

    do you deny that the paragraph "the impedance of inductors increases as frequency increases;"
    and " a loudspeaker does not have a constant resistance across its frequency range "
    are on those two articles?

    if you do, you are paranoid. if you dont, there is nothing left to discuss.
    and if you decide to just write 2 pages of response, remember :
    two pages are almost as much as wikipedia's article. why would you make someone read 2 of your pages, instead of send him to those two articles?? maybe becouse they say diferent things than you??...

  9. #69
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    deleted 25July13 20:00Z
    Last edited by OldSpark; 07-25-2013 at 05:11 AM.

  10. #70
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    Quote Originally Posted by OldSpark View Post
    (Actually a speaker does have a constant resistance across all frequencies. It's only its impedance that varies. Not that I'm one to get trivial with your statements. :wink
    that is what i was saying from the begining. glad we reached an agreement

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