Dual-Gate J310 JFET

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One could call this arrangement of J310 transistors a JFET tetrode. They are similar to dual-gate MOSFETs, but with the characteristics of a junction FET. Once widely used in their TO-92 through-hole versions, the J310 is now available only as a surface-mount device. Pete N6QW pioneered the use of the 310 in a dual-gate arrangement. These little half-inch breakout-boards might make experiments and home brewing with them a bit easier.

The breakout boards come with the J310s pre-installed. You can add wires or leads as you desire. They would work particularly well for “Manhattan”-style construction.