Hi Nicolas
You know that I do not like to intrude into the work of others, I accept only what the author says. In this case, Andreas talked about special infrared sensor and for me this is important because it confirms the link between Lrls and infrared radiation, and I am convinced that there are several ways to use this link. I want to implement the circuit with LEDs and infrared diode and compare the output signal with the signal of my LRL. In this way, we could discriminate the gold given that there seems to be an affinity between infrared radiation and gold.
Best Regards
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