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xeno_tropic,
Every parameter that you mentioned is critical
(wire diameter, core diameter/length, # of turns). Obviously you
need to keep the device specification tolorance in mind before answering these
questions. I can tell you that small variations in the four variablesyou
mentioned can have large consequences from an inductance
perspective.
The inductance of a solonoid is a strong function
of the number of turns and the core material permeability. The wire
diameter has less of an effect on the inductance at audio frequencies as long as
we assume the wire diameter is much smaller than the core diameter.
Hope this helps....please get other
opinions!
James
----- Original Message -----
Sent: Tuesday, August 20, 2002 6:20
PM
Subject: [femm] Solenoid Question
Hello. I have a question. I do not need to know about
solenoids
specifically, as in actuators. I am building variations of a
device
which must generate a time-varying magnetic field at audio
frequencies.
The current source is the audio output jack of a CD
player.
I wound a small coil around a ferrite core, using fine magnet wire
from Radio Shack, two layers, tightly wound both leads at one end.
Now
I wish to make many of the devices, and wish to avoid winding all
those
coils. I would like to purchase ready-made ferrite core coils.
My question
is, what factors might affect:
1. The strength of the magnetic
field
2. The signal characteristics as to reproducing it
faithfully,
like the first coil I made
Is wire
diameter, number of turns, diameter or length of core
critical? It isvery
important that I get this right.
Thanks in advance for your help.
James
Roberts
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