On the schematic the arrow for the gate is centered meaning the device is symmetrical. The drain and source can be switched with no ill effects. Jerry K5LRU Harwood, Texas > -------- Original Message -------- > Subject: [minima] Re: J310 mixer question > From: "Steve VK2SJA" <vk2sja@xxxxxxxxxxx> > Date: Tue, February 25, 2014 4:51 pm > To: minima@xxxxxxxxxxxxx > > > 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 > >