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# Solenoid Question

- To: femm@yahoogroups.com
- Subject: Solenoid Question
- From: "xeno_tropic" <xeno_tropic@yahoo.com>
- Date: Wed, 21 Aug 2002 00:20:49 -0000
- User-agent: eGroups-EW/0.82

    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 is very important that I get this right.
    Thanks in advance for your help.
    James Roberts

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