What's the catch with this topology

[kingkorg]

I've been trying to wrap my mind around this one, the first stage puzzles me. What's the catch with this arrangement? Any advantages? Minimize Miller effect?

 

[Gus]

Looks a little like the link in reply 29. IIRC Dale traced this
https://groupdiy.com/threads/neumann-tlm-circuits.2336/page-2#post-865730
Mixed with reply 1 attachment HPF part
https://groupdiy.com/threads/original-studio-projects-c1-hpf.67811/
B1 if the schematic is correct
Cascode input
capsule is drawn wrong, it is a cardiod(minor error one line should go to the backplate not the rear membrane)
No DC regulation would need to sim or test one at 42VDC to 52VDC or even higher or lower voltages.
IMO still gets the output wrong, CMRR issue.

 

[abbey road d enfer]

Looks a little like the link in reply 29. IIRC Dale traced this
https://groupdiy.com/threads/neumann-tlm-circuits.2336/page-2#post-865730

Ain't it funny how they look similar? You wouldn't think Neumann have copied Behringer?

B1 if the schematic is correct
Cascode input

Cascode is known for minimizing Miller capacitance.

IMO still gets the output wrong, CMRR issue.

Many designers put equal value caps and resistors as a first approximation. here it's not worse than the unbalance in a Schoeps circuit...

 

[kingkorg]

Thanks guys!

 

[ccaudle]

I've been trying to wrap my mind around this one, the first stage puzzles me. What's the catch with this arrangement? Any advantages? Minimize Miller effect?

Bootstrap minimizes capacitance, and also FET distortion (by eliminating changing voltage across the FET it always operates at one point on the load line).

 

[JohnRoberts]

I find it amusing that the signature block says "reverse" engineer by....

JR

 

[analogguru]

I find it amusing that the signature block says "reverse" engineer by....

JR

Would you prefer:
"faulty tracing by.... "
No one knows, why the faulty tracer needed to put the Behringer logo there and make the appearance in a way that it looks like an official schematic.... what it isn't...

 

[JohnRoberts]

damn... fake news everywhere....

JR