Eeyore wrote:

Fred Bloggs wrote:


Phil Allison wrote:


** Jim only asked for a gain equation - then ignored it when it was posted
by me.

Your equation was wrong


No it wasn't. Since you reckon you're so clever why not give a 'better' one ?



I already did, stupid.


and the entire article is mere mindless dictate.
There is no explanation of circuit operation because there is no
understanding of it. The operating characteristics of the gain elements
are only nominally regulated and the THD is bad.


Absolute nonsense. What level of THD do you predict ?

Bad numbers like 5-10%.




I don't believe the equivalent en of 2nV per root-hz


It's probably better than that in fact.

No way at low gains, the Q2 noise referred to the input is large by my
calculations.




or the CMRR of 60dB for one second,
those figures are extremely improbable.


Really ? That configuration typically exceeds that figure.

Not possible with 1% resistors, the claim is bogus.




Then the comparison to the
SSM2017 performance and architecture is the penultimate
misrepresentation, the circuit concepts are completely different, and
your kluge just isn't the same leagues. You would have been better off
using a TL074.


Using a TL074 for a low Z mic input ?

Bwahahahahahahahaha ! You're another IDIOT.

Graham



Thompson's SPICE simulation show 2x worse noise than the '074.