A Revised Inductance Calculator

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
exist.

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.

http://www3.telus.net/chemelec/Calculators/A-Inductance.htm

If Interested, Check it out.

Take care......Gary

 

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
regards
john

 

..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.

mike

 

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

 

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?

mike

 

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

mike

BTW love the book, if i haven't already told you directly.

 

"Active8" wrote ...

Capacitance-Frequency-Inductance CALCULATOR
http://www.opamplabs.com/cfl.htm

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

 

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?

 

Grab the source from his calculator.

 

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.

 

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

 

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.

mike

 

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 ?

mike

 

if you can read JS.

 

In sci.electronics.design, Active8 <>
wrote:


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]

 

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.

mike

 

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

Take care.....Gary

 

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.

Cheers,
Tom

 

That sinking feeling you get when you realize that you have just farted in
public

 

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

Take care.......Gary