Mike Preamp (from S.E.D) - MikePreamp.pdf
"Eesyore"
Jim Thompson wrote:
From a discussion on S.E.D
Congratulations. Your R15 has just degraded the noise figure.
Correction. not so. I'd missed the value change.
** The noise ( at 1.36 nV rt/Hz ) is just a little worse than for the
Project 66 schematic.
Note: that figure is for a shorted input rather than a 200 ohms source.
Current in the transistors is the same, but there is one resistor change
that adds a pinch.
The 33 pF caps produce an earlier HF roll off than project 66 does.
........ Phil
|