"amdx" wrote in message
...

"Dave" wrote in message
news
Am trying to bias the JFET in the attached schematic to feed signal to
the following BJTs while keeping Vgs very near Pinch-Off. Works fine as
long as the batteries are fresh, but as they begin to wane Vgs surpasses
Pinch-Off (which is 4.0 volts for the JFET I am using, while I try to
hold it at 3.95 VDC.) It has been suggested that I use a BJT (configured
for Common Emitter) to do this, but I am in the dark as to how this might
be accomplished. ANY help would be greatly appreciated...

Thanks,

Dave

Hi Dave,
I just want to give a reminder about the Dallas files.
They have been moved and are being added to
a yahoo forum.
http://groups.yahoo.com/group/thedallasfiles/
He has not got all the files updated on the forum but
some are there.

Here's a High Z preamp with adjustments to improve IIP2.
I don't think this fills your need. but it shows his FET biasing.
Keep watching, he had a lot of amps for MW and SW on the other site.
I hope he posts all the previous files.
http://f1.grp.yahoofs.com/v1/cJXZTRF...mization. pdf
Mikek


Hey Mike, just wanted to mention that this last link appears to be broken
(the one for the High Z preamp). Just thought you'd want to know...

Dave