Pro Audio Design Forum

... would be double. The outputs of IC3 and IC4 feed both the output Phoenix connector through R21 and R22 as well as the input to the differential DeBoo correction servo. Differential Servo and Bias Network The Flat Balanced Input Moving Coil Preamp is direct-coupled from input to output. There ...

Take a look here at some servo bandwidth tests I did with an OP07: https://proaudiodesignforum.com/forum/p ... t=20#p4999

You might want to read the full thread.

I compared using a differential Deboo integrator, and a non inverting two caps integrator. Integrating capacitor(s) insulation resistor does result in DC offset error in both cases. With the Deboo the resistor mismatch brings a similar effect. ...

Using a Deboo configuration, the unavoidable resistor mismatch results in an additional parasitic resistor across the capacitor of a positive or negative high resistance. Use precision resistors or a trim if its that critical. ...

There is a catch in the Deboo integrator, differential or single. It is sensitive to resistor mismatch. This can be important or not, depending of the application. When in need for near perfect integrators, one needs capacitors with very ...

"Consider The Deboo Integrator For Unipolar Noninverting Designs," Elliot Simons, Maxim Integrated Products, Electronic Design, March 18, 2002. The non-inverting Deboo integrator has a passive input pole which is important for audio ...

... board. I made the hole pattern identical so it will be possible to switch out boards between MM and MC boards in the same metalwork. I scaled the Deboo capacitor and resistors to accommodate a 5 mm 0.33µF polypropylene which is the largest value in that case size. C7 and C22 can also accept 8 ...

Thanks, you save me a lot of time pointing to me in the right direction. The Deboo can be fine, depending of the application and one cap only is nice for a differential. I abandoned the Deboo in an application where I want the servo loop to give a very best servo ...

My point was at HF where they stop being capacitors and become "inductive."

The Deboo works fine for what I want. I like its passive input pole.

... of this additional real pole depends on the servo topology, if the signal feeding it is already adequately LPF it could be redundant. JR _The Deboo's resistance tolerances turns it into an equivallent resistor leakage at the cap. This is the reason, I have abandonned the Deboo. _The input ...