After tuning the circuit using a separate tuning board , I found out that I calculated this capacitance wrong the first time! Right now, I have a placeholder 7pF capacitor until I make some measurements to get the perfect value to get near 13.56MHz resonance.
(If you used a 56pF cap, this design would resonate at around 10.2MHz.)
2y
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By the way, you can find the Instructables for this project here
markwuflux