Phil Allison wrote:

"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.

-3dB @ 32 kHz in fact. A bit low for my liking for sure. That'll be intrusive at
20kHz too..

Graahm