typo?

Discussion in 'Feedback and Suggestions' started by skfir, Aug 18, 2010.

  1. skfir

    Thread Starter Guest

    In the chapter "resonance"
    /vol_2/chpt_6/6.html
    when it is about parallel resonance circuit, the parallel circuit is, in my opinion, mistakenly called to be a series.

    "A parallel resonant circuit is resistive at the resonant frequency. (Figure below) At resonance XL=XC, the reactive components cancel. The impedance is maximum at resonance. (Figure below) Below the resonant frequency, the SERIES resonant circuit looks inductive since the impedance of the inductor is lower, drawing the larger proportion of current. Above resonance, the capacitive rectance decreases, drawing the larger current, thus, taking on a capacitive characteristic."
     
  2. skfir

    Thread Starter Guest

    There are also some little typos: "prodces a low peak"
     
  3. Wendy

    Moderator

    Mar 24, 2008
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    Why not register, you can interact in more detail, and it is free?

    Thanks for the feedback.
     
  4. Skfir

    Active Member

    Aug 19, 2010
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    Yes, you are right, sorry. Thanks.
     
  5. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Welcome to the forum.
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    If you have any questions, start asking.
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    There is also the eBook, see the tabs on the top of the page.
    Did you also look at the useful websites thread:
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    Or the RF related links thread:
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    Bertus
     
  6. Skfir

    Active Member

    Aug 19, 2010
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    Thanks mate! I did. It seems I found some typo again:

    /vol_2/chpt_8/6.html

    "The output voltage to the load at this point actually exceeds the input (source) voltage! A little more reflection reveals that if L1 and C2 are at resonance, they will impose a very heavy (very low impedance) load on the AC source, which might not be good either."

    There is no C2 there :(
     
  7. Wendy

    Moderator

    Mar 24, 2008
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    18 paragraphs down, about 2/3 down the chapter.

    [​IMG]


    Unexpected response of L-C low-pass filter.

    What was supposed to be a low-pass filter turns out to be a band-pass filter with a peak somewhere around 526 Hz! The capacitance and inductance in this filter circuit are attaining resonance at that point, creating a large voltage drop around C1, which is seen at the load, regardless of L2's attenuating influence. The output voltage to the load at this point actually exceeds the input (source) voltage! A little more reflection reveals that if L1 and C2 are at resonance, they will impose a very heavy (very low impedance) load on the AC source, which might not be good either. We'll run the same analysis again, only this time plotting C1's voltage, vm(2) in Figure below, and the source current, I(v1), along with load voltage, vm(3):


    [​IMG]
     
  8. Skfir

    Active Member

    Aug 19, 2010
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    Yes, I inderstand, but sorry, there are c1, l1, l2, rload on the schematic, but not C2, I am just a bit confused...
     
  9. Wendy

    Moderator

    Mar 24, 2008
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    I don't think anyone is arguing, I was pointing out the specific location for our editor, Dennis Crunkilton. Finding this stuff can be challenging.
     
  10. Dcrunkilton

    E-book Co-ordinator

    Jul 31, 2004
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    Thanks Skfir for pointing out these two typos. I have made the corrections in the master copy at ibiblio.

    Dennis Crunkilton
     
  11. Skfir

    Active Member

    Aug 19, 2010
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    No worries mate! A bit more:

    /vol_2/chpt_13/2.html

    A motor driven by square waves of current, as proviCed by simple hall effect sensors,

    May it must be written "provided"?
     
  12. Skfir

    Active Member

    Aug 19, 2010
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    Here
    /vol_2/chpt_13/6.html

    It is also possible the put the rotor on the outside surrounding the stator.

    Should it be TO put the rotor? Sorry, I am far from being an native English speaker, so, I don't know...
     
  13. Skfir

    Active Member

    Aug 19, 2010
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    One more thing about the chapter "AC motors" Wouldn't it be better to start the chapter from "Tesla motors"? Because all the basics of AC motors, torque and motion itself are explained in that very part. When I red "Synchronous motors" which is the first one currently, I had many things I didn't really understand, until I red "Tesla motors" part...
     
  14. beenthere

    Retired Moderator

    Apr 20, 2004
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    Yes, that is correct.

    That is more technically correct, but not everybody recognizes Tesla's contribution to the development of the AC motor. You might notice that credit is given to Tesla in the material.
     
  15. Skfir

    Active Member

    Aug 19, 2010
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    /vol_2/chpt_13/12.html

    He formlated the laws of magnetic hysteresis in finding a solution.

    Should it be said formulated?
     
  16. beenthere

    Retired Moderator

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    "Formulated" is correct.
     
  17. Skfir

    Active Member

    Aug 19, 2010
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    /worksheets/static.html

    question 5
    This mechanical work becomes ßtored" in the electric field

    Is it to be said "Stored"?
     
  18. beenthere

    Retired Moderator

    Apr 20, 2004
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    Also correct.
     
  19. Skfir

    Active Member

    Aug 19, 2010
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    /vol_1/chpt_12/9.html


    Tables of specific resistance and temperature coefficient of resistance for elemental materials (not alloys) were derived from figures found in the 78th edition of the CRC Handbook of Chemistry and Physics.

    Table of superconductor critical temperatures derived from figures found in the 21st volume of Collier's Encyclopedia, 1968.


    Good! But there is nothing there :(
     
  20. Wendy

    Moderator

    Mar 24, 2008
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    Suggestion, use full links, like this...

    http://www.allaboutcircuits.com/vol_1/chpt_12/9.html

    Otherwise, following your pointers is a real pain in the buttocks.

    Unfortunately we don't have a mechanism for the worksheets as of yet. Only corrections to the AAC can be currently handled.
     
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