Hello, thank you for your comments on the PD forum, I was doing PD detectors, I do not know the parameters of TX RX and L7L8, L7L8 I did not do that part of the circuit, may I ask what is the function of SW2, G and B are the same is work it, I found it not, no sensitivity to metal, just a little pressure on the TV reaction, ask for your help, I wish you a pleasant
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