Originally posted by Selfsimilarity
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Save yourself a lot of time and money-
remove the voice coil from an old speaker (preferably one rated over 50 W).
A razorblade will help.
You can even power it with an audio amplifier. Download an tone generator app for your phone and use it as an input signal. Home speakers are generally 8 ohm and auto speakers are usually 4 ohm. You will produce a magnetic field, but using a sine wave won't heat up the wire as quickly as pure DC.
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