I don't understand your question. The output should be 0 DC voltage. And what does the speaker have to do with it?!
It's easy to check. We can connect with video and I will be able to measure preamp output DC for you. Or you can see it in the Microcap yourself
My circuit has fine DC servo with eTrim opamp OPA192 and guarantees < 5uV DC (not mV but uV ! ) output offset (no need electolytics caps at input, inside or output) both with idle output and with any load up to short circuit. Instead of 500 uV offset of 5532 Pearl 3 output. See here
Attachments
Konard, the schematic has been reported as copyrighted material. This is the third time we need to remove it.Please play by the rules:
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I don't see such elements as JFE2140 and OPA192 in Kenwood. I also see many electrolytic capacitors in Kenwood.
All circuits have similarities. Because they consist of common elements. These elements are called resistors, transistors, capacitors. It's like music. It also consists of sounds and notes. Only in one case we get a symphony, and in the other case, cacophony.
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We cancel all patents - since the presence of transistors is a sign of the same circuit - because “Because they consist of common elements”!
But seriously - the question was about “fundamental” differences, and not about different markings of parts
as for OPA192 - this is the use of Kenwood circuitry (Kenwood - Sigma-Drive Technical Guide) -
https://www.diyaudio.com/community/threads/kenwood-sigma-drive.135517/
https://ru.scribd.com/document/411868140/Kenwood-Sigma-Drive-Technical-Guide
Changing the resistor or capacitor value leads to fundamental changes in the transistor's operation. Even a schoolboy knows this. In one case, the transistor works as an amplifier, in the other, it is excited and works as a generator.
I think it's time for you to calm down. And engage in constructive creativity. Come up with your own scheme and get to work. No need to hype and parasitize on other people's developments.
when there is no question, there is always an answer
the opposite is also true!
I asked understanding people "How is your scheme fundamentally different from this ancient Kenwood ka-9100-9150?"
I am convinced that the answer to this question is of interest to many forum participants
but other than “you are sick patients of Dunning Kruger” - there were essentially no more answers.
This is for uninvolved users. For the rest, it is enough to look at the diagram, the package and, most importantly, the parameters. Do you have any questions about them? Subject to the measurement conditions, of course. With a shorted input or chaos at the input, they will be radically different.
I have a new version of the factory-made board, with gold-plated contacts at a cheaper price, including a power supply of your choice - either with a step-down transformer and stabilizer, or a DC-DC converter, operating from any unipolar voltage source from 4 to 30 Volts.
You write offensive things. We discuss conceptual solutions and their results here. I am ready to sell my author's crookedly soldered sample for twice the price of a factory copy. Do you mind?