-=> Mike Ross said to Greg Mayman
 -=> about "I/F" on 01-06-03  22:26.....

 MR> How does it help? For example say we have an N type JFET, and let's
 MR> say the signal at the drain is rising positive. From what I've
 MR> experimented, at small signal levels the drain resistance stays pretty
 MR> much constant. Adding an extra positive bias to the gate would make the
 MR> drain resistance drop so keeping the signal voltage constant? Why would
 MR> I want that unless I wanted some compression? Maybe I'm mistaken here
 MR> however. 

In an audio application, even a 10% non-linearity -- which is
pretty small by DC standards -- is a lot.

I suggest you set up the FET as a shunt attenuator, set the gate
voltage for 6dB attenuation with about a 1v RMS input signal, and
measure the output on a good distortion analyzer. Then add the
audio feedback from the drain to the gate and see how the
distortion decreases.

From Greg Mayman, in beautiful Adelaide, South Australia

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