Biasing the BF2040

I biased the proto board with a 5volt regulated supply and divider. The three resistors have .5ufd caps across them.

This is the 3 stage board.

closeup with some labeling.  The source should go to ground. I used a 4 ohm resistor in the test circuit so I could read the drop across it to check channel current. If you use a 6 volt supply you could connect the drain to it. Check the spec sheet. I think it would allow 8 volts on the drain. I had a 9 volt supply so used the 5 volts.