Posting the image of the simulator schematic and the FFT graph that it produces would be pretty helpful too.
Hi Steve,
Welcome back - I hope all tests & treatments went well and wish for you continued improvement in your health.
Welcome back - I hope all tests & treatments went well and wish for you continued improvement in your health.
traderbam,
As this is a non-feedback output stage, I would not worry about slew-rate or any dynamic distortion for that matter.
The designer`s goal should always be to use devices in their most linear region. It`s not the case here.
As this is a non-feedback output stage, I would not worry about slew-rate or any dynamic distortion for that matter.
syn08 said:
You could use any of the ones I show in any of the schematics. I did change the ones I show because the ones I used in the production units have been discontinued.
Lumba Ogir said:
Engineering is all about trade-offs. Declaring that all transistors should always be used in their linear regions is ignoring the wider realities. After all, no transistor has a linear region in all respects.
I agree that an OL OS has fewer constraints upon it than one that is to be controlled by FB. But nevertheless, we are dealing with very small distortions and a 4 transistors that need to cooperate dynamically, while driving a variable load impedance. The large signal behaviour is important. If one can achieve a better overall response by trading off driver linearity, then so be it.
I am second guessing SD here, which is a hit and miss process. It would be helpful if Steve D. were to explain his own design choice.
It's like pulling teeth! 
Obviously, I didn't see you answer!
The question is (again): Why didn't you use emitter resistors on your drivers in order to bias them into class A?
You are under no obligation to provide an answer, but please don't muck about. Thanks.
Obviously, I didn't see you answer!
The question is (again): Why didn't you use emitter resistors on your drivers in order to bias them into class A?
You are under no obligation to provide an answer, but please don't muck about. Thanks.
traderbam said:It's like pulling teeth!
Obviously, I didn't see you answer!
The question is (again): Why didn't you use emitter resistors on your drivers in order to bias them into class A?
You are under no obligation to provide an answer, but please don't muck about. Thanks.
Dream on
traderbam said:It's like pulling teeth!
Obviously, I didn't see you answer!
The question is (again): Why didn't you use emitter resistors on your drivers in order to bias them into class A?
You are under no obligation to provide an answer, but please don't muck about. Thanks.
Here I go mucking about again.
Some people have stated in this thread that my design does not work. Some have stated that they do not believe it works the way I say it works. There is little point in me explaining my design choices if you believe the design is so badly flawed. You seem to be adamant that I am wrong on every point. I have no reason to believe you will accept any explanation I give.
Maybe there was no design process. I simply dropped a bunch of parts on a circuit board and got lucky.
Moi? I don't don't recall ever saying your wonderful OS is badly flawed. It is a work of art. Beautiful.
It isn't really to please me that you may choose to address this question with enthusiasm, but for other followers of this thread, like Lumba, who have valid puzzlements.
Personally, I'm not that interested.
It isn't really to please me that you may choose to address this question with enthusiasm, but for other followers of this thread, like Lumba, who have valid puzzlements.
Personally, I'm not that interested.
Ahh , come on guys.. It does work.. It is just different.
In a year , after a thousand have built it , it's operation will
be as apparent and dissected as the
common "blameless" or "leach" 🙂
patience.. 😉
OS
In a year , after a thousand have built it , it's operation will
be as apparent and dissected as the
common "blameless" or "leach" 🙂
patience.. 😉
OS
Since I put the OPS artwork up... 300 DL's , 1/3rd there..
In 3 days..
In the original "krill" folder over a thousand downloaded
the 50 and 100w schema's as well.
OS
ostripper said:
I have received E-mails from several builders that have successfully built the amp already. They are pleased with the performance and even (if this is relevant), the sound. There have been reports of slight overshoot on the leading edge of square waves above 100KHz. I will have to work on that.
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