Hi mustefa,
I think the lrls can reveal all the non-ferrous metal but copper probably needs more time to emit the phenomenon. Quartz lrl is more simple to build, 4046 Lrl needs more amplification, but are substantially equal in performance. The phenomenon changes the phase and the amplitude of the amplified signal and the phase comparator of the CD4046 indicates the variations of phase with the VCO of the CD4046.
Regards
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