Hi Giorgio, Short answer. Does not matter. The J310 device is "symmetrical". For the long answer, look for the section entitled "Symmetrical Construction" in the link below:- http://www.cliftonlaboratories.com/jfet_variation.htm 73, Steve. > Hi > I have a doubt about J310 connections: > > are the 2 pin connected together to the trimmer via 4k7 resistor the > drains or sources? > > Sorry if this question was already andwered but I don't find any info. > > Thanks > > 73 Giorgio > > Inviato da iPhone >