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A Revised Inductance Calculator

Discussion in 'Electronic Basics' started by Gary Lecomte, Jul 30, 2003.

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  1. Gary Lecomte

    Gary Lecomte Guest

    Hi All, I have revised my Java Script Inductance Calculator. It now
    covers the wire ranges from 1 to 45 Awg, including the half gauges
    from 10 1/2 Awg to 25 1/2 Awg. Most people aren't even aware these

    I have also tested it with numerous known coils for accuracy. This
    Calculator take into account the typical insulation thickness of
    Single Coated Enamel Wire, as this is important for accurate
    calculations on smaller gauges.

    If Interested, Check it out.

    Take care......Gary
  2. John Jardine

    John Jardine Guest

    For curiosity, as a reel of bare wire was next to the keyboard, wound a
    random coil on a pencil ... (equiv') 25Awg, 0.833" long, 0.328 diameter, 12
    turns pulled out to that length. Measured as 1.0uH (GenRad 1685 digital
    Impedance meter). The L calculator said "0.5uH". Was going to whinge but
    have just found my sodding LCR meter is faulty.
    Yes, your calculator works well ;)
  3. Active8

    Active8 Guest

    ..03uH coil - rounds to .1uH (.0001mH)

    32 AWG one turn coil on .25" ID should be 1 turn. program solves to 3
    turns prob due to rounding.

  4. Active8

    Active8 Guest

    why not add core permeability input and std core dropdown/combo?
  5. Active8

    Active8 Guest

    the LC calc... a designer would want to know what cap to use for given L
    and f or what L for given C & f. my programs use a "solve for" check box
    next to the text inputs.

    nice wind chill charts, i think. i have this nomogram, but it calculates
    comfort level. any idea how that corresponds to temp?

  6. Active8

    Active8 Guest

    is that achived at google? if so, what's the subject line to search on.


    BTW love the book, if i haven't already told you directly.
  7. "Active8" wrote ...
    Capacitance-Frequency-Inductance CALCULATOR

    Voltage-Current-Resistance-Power CALCULATOR
    Resistance-Frequency-Capacitance CALCULATOR
    dbm-Voltage-Impedance CALCULATOR
    Zener Voltage Regulator CALCULATOR
    Loan-Monthly Payments CALCULATOR
  8. Reg Edwards

    Reg Edwards Guest

    How do you define 'length' of a coil?

    Is it the axial distance between the two extreme ends of the wire, or is it
    the distance between the wire centres at the ends of the coil? Or is it the
    number of turns times the winding pitch.

    Or what is it? It matters when there are not many turns.

    What do Grover, Wheeler, etc., have to say about it?
  9. DarkMatter

    DarkMatter Guest

    Grab the source from his calculator.
  10. DarkMatter

    DarkMatter Guest

    That's just it. Ten turns of wire bears out a different inductance,
    and the difference is the core configuration!

    Also making the same inductance across ten different core types will
    make ten equal value inductors, but they will all perform entirely
    differently one to another. Raw sines are one thing, but complex
    waveforms behave differently than the simple LCR bridge stimulus.
  11. Gary Lecomte

    Gary Lecomte Guest

    Hi Mike, Pretty Small Coil. Yes, this is due to Rounding. I can fix
    this, but even if I change this, the next person will come up with a
    ..003 uH coil, or even smaller. How small should I go?

    Take care.......Gary
  12. Active8

    Active8 Guest

    thanks. i really don't need any calculators. i write my own. i'm just
    looking around for different L calc to compare to another program, the
    accuracy of which is suspect.

    that loan calc...

    i used a loan pmt formula out if a TI calculator book once when i was
    16. and when i went to the bank for a loan for my first car, I found out
    that the bank didn't calculate payments based on that formula.

  13. Active8

    Active8 Guest

    i'd like to know, too. how long is a 1 turn coil?

    wouldn't the center to center distance be the same as N X pitch ?

  14. Active8

    Active8 Guest

    if you can read JS.
  15. Ben Bradley

    Ben Bradley Guest

    In, Active8 <>

    This somehow didn't get attributed, but it was written by Win Hill:
    I've put in some likely keywords and got topics with subject lines
    of "If I only had a brain" and "tomato launcher" which Win
    participated in back in 1977. I've only been a semiregular here for a
    year or two, looks like I missed a lot of good threads.
    Megaditto's. [I gotta stop listening to talk radio]
  16. Active8

    Active8 Guest

    heh, heh. that's two of us. NGs turn up some funny stuff at times. I'm
    hoping Win will come back and zero me in on that thread.

  17. Gary Lecomte

    Gary Lecomte Guest

    I never heard anyone ask this question before.
    The Length of the coil is the "MEASURED LENGTH of the windings, END TO
    For this calculator and any other formulas (I have seen) to work
    accurately, All layers must be equil length.

    Take care.....Gary
  18. Tom Bruhns

    Tom Bruhns Guest

    I have a program that works quite well from very tiny to quite large.
    After all, it's just scaling, ummm?? Anyway, it happens to make it
    easy to do coils down in the 0.05" diameter region, and they are
    sometimes useful. Just wind some wire on a small machine screw; it
    will typically hold its shape well when you unscrew the screw from it.

    When I have some time I might try comparing your web script with a
    program I've learned to trust. No time right now. Does yours give
    the equivalent capacitance and self-resonant freqs for the first
    parallel and first series resonances? How about Q at some input
    frequency? Those are useful.

  19. Fred Abse

    Fred Abse Guest

    That sinking feeling you get when you realize that you have just farted in
    public :)
  20. Gary Lecomte

    Gary Lecomte Guest

    Quite Simply, a one turn coil is equivalant to the diameter of the
    wire you are using.

    Take care.......Gary
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