I tried them. I didn't get any results, but there is a circuit I modified. I detected it with it. Frequency of 68.4 khz. I have magnetic field that I found by accident.
I didn't say they work. LOL I'm saying there is some info there. I doubt anyone is going to give you their working design. As for frequency, I'vE never worked at that high, most is in the audio range, but there are many harmonics.
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