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I found this pdf ( this one: http://www.epemag3.com/lib/free_proj...e%20Hunter.pdf ) a while back and chose to build it as one of those "in my spare time" projects. I could have sworn I found it linked here on geotech somewhere, but I guess not!
I'm looking at the coils now, it's a DD type of setup, and the author's coils are (both) 100 turns of 30awg on a 150mm circle. I want to build my coils for this a bit smaller, so I was doing the math... and it says these should have about 4.1mH inductance, which seems really high to me, but I'm no expert. The tx oscillator is feeding the coil a frequency that's somewhere around 3.3kHz, if I remember correctly (not sure if that's terribly relevant).
Is 4.1mH pretty high for a coil setup like this? I'm used to seeing values more in the uH range.
I'm looking at the coils now, it's a DD type of setup, and the author's coils are (both) 100 turns of 30awg on a 150mm circle. I want to build my coils for this a bit smaller, so I was doing the math... and it says these should have about 4.1mH inductance, which seems really high to me, but I'm no expert. The tx oscillator is feeding the coil a frequency that's somewhere around 3.3kHz, if I remember correctly (not sure if that's terribly relevant).
Is 4.1mH pretty high for a coil setup like this? I'm used to seeing values more in the uH range.
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