Hi jocelito and king40
The circuit oscillates at about 5 Mhz and it's "disturbed" by the signal from antenna filtered by L1/C1, but I don't know what kind of signal is, but it acts by decreasing the signal that goes to ground and then increasing the output signal. The antenna is a normal stylus or a small brass tube about 25 or 30 cm and yes this is my Last pcb and schematic. I have tried other solutions for the pcb but this is the only working and this makes the building a little difficult.
Best Regards
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