I must admit this air-core coil is very fragile. For starters, I used just a pound or so pull on the wire as I did the winding and now I realize the 1" x 2" wood frame is just barely adequate. Stiffer wire (thicker) is going to have even more strain on the frame. And the thin wires are so delicate, I'm glad I didn't go any thinner for the first time project. Anyway from what I take the thin wire is okay for lower frequencies.
So what I did was to turn on the frequency generator, tune the coil for peak voltage, then use uA meter and look for anomolies. Also I tuned frequency started at 59.5 KHz and went up until I found something the coil liked.
Would I suggest anyone build this project? No way! You should have seen the mess I had on the first attempt. I had half the wire on after a couple hours and numerous tangles of the wire on the small spool when i realized the first few turns were slack. So I tried to tighten them and they just started to fall off the frame. Then everything got tangled. So after untangling and winding a large part back on another small spool I finally realized that I needed to wind the wire on the bike rim first.
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10-28-2010, 01:00 PM
Threaded Mode