"amdx" wrote in message
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"Dave" wrote in message
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"amdx" wrote in message
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"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
Sorry, start here, signup and go to files and then amplifiers.
http://groups.yahoo.com/group/thedallasfiles/
Mikek
Gotcha. Thanks.