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# Re: Solenoid Question

- To: femm@yahoogroups.com
- Subject: Re: Solenoid Question
- From: "xeno_tropic" <xeno_tropic@yahoo.com>
- Date: Wed, 21 Aug 2002 03:40:08 -0000
- In-reply-to: <000f01c248be$12746800$1000a8c0@JamesStephenson>
- User-agent: eGroups-EW/0.82

    --- In femm@y..., "James Stephenson" <j.stephen@a...> wrote:
    > 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 variables you
    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.

    I appreciate your answer. I will seek coils as close to my original
    as is possible. I am basically using the electromagnets to alter
    human neurological function. The CD contains signals that mimic
    certain characteristics of the electrical signals generated by
    neurons. The wire diameter is fine, and the core diameter is very
    large compared to the wire. As the current source is the audio output
    of a CD player, I assume, as in small audio transformers, that many
    turns of fine wire helps to faithfully reproduce the frequency.
    Thanks again.
    James

- References:
  - Re: [femm] Solenoid Question
    - From: "James Stephenson" <j.stephen@attbi.com>

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