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hi i am new to this forum and metal detectors but i have made garys (chemelec) pi 1 detector with a lot of phone calls to Canada courtesy of gary but got there and it works !! i have now bought silverdogs surf pi to build. i like building more than searching . i am trying to get my head around simple electronics and schematics so up ward struggle, so is there any one out there that would knot mind the odd phone call if i need help.and if i am really lucky is there any one in the Norwich area, any way my son has a tr400 cscope approx 20 years old is there any thing i could do to improve it regards steve