The new sensor stage, self oscillation type, it's very critical and unstable and I do not recommend. Instead I have modified the Lrl with CD4046 and I lowered the frequency to about 59 Khz (gold frequency?) It's very stable but I have not tested on real field. I used a ferrite coil with 200 turns (1.8 mH). If the lrl is ok on the field I will post the circuit diagram.
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