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[PCB Prototype] elements of metal detector 2010 emanuel douglas

hello dear mr . pleas say what is PI or P1 and p- , p+ in PCB of metal detector 2019?thank youapology for i am very weak in english. excuse me.
Ranking Name Answers
1 PCBWay Team 11
2 Jonathan Scher 3
3 Paul Hupman 2
4 Samarth Jiwarajka 1
5 Engineer 1
6 Ibrahim TKR 1