Bias regulator circuit in most amps is one transistor and two resistors.....in HCA-22 amp the bias regulator circuit comprises Q301 and Q302 and associated resistors.
JC, what is the reason for or advantage of this implementation ?.
Dan.
JC, what is the reason for or advantage of this implementation ?.
Dan.
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It is me which is so shamed and sorry to have misspelled your name, Scott. Please accept again my apologies.
I was taken aback by Mark Johnson's strange and aggressive response with the feeling I had asked something witch could be under some kind of a non disclosure agreement, or that my original question was written in a rude way.
Thanks for your answer, I will try to find your previous entries about this subject.
Reading between your lines, if I understand well, if you started with the usual practice (design with calculation, prototyping, measurements, adjustments) before to go in the industrial chain of production, it seems that simulations program are good enough nowadays for the designers of integrated circuits to go directly from simulations to fabrication ?
But then, you will discover the real performances of your project only when it is finished and took the risk, if any mistake, to had engaged a very expensive industrial process for nothing ?
You will forgive my curiosity, but are your simulation programs taking automatically into account all the parasitic element of a circuit (inductances and capacitances) ?
And last, (but not least ;-), are the final physical design of the different layers/masks done automatically, or under your control ? I mean, the same way than our CAD programs that we can re-route to prioritize some paths etc. ?
Sorry to ask-you so much questions. When I was a little child, I had dismounted (imagine the massacre) my mother's radio to try to find the guy talking in it. And, nowadays, looking at those height legs insects, i feel like a chicken in front of a dollar coin. ;-)
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More than one all-MOSFET chip was built during the 1970s using "MOScrons" as the snap-to grid.
1 MOScron = (1/25) * (1/1000) * (1 inch)
i.e. 25 MOScrons per mil. Not 25.4, that's too confusing. 25.
Even if one realizes the difference that you´ve mentined above it is still possible that patents and IP might be outdated concepts.
And of course it is questionable if the patent concept ever worked in the way you seem to think/wish it should/is.
Isn´t history of technology full of examples where the original inventors were simply pushed out?
Isn´t there a lot of evidence that using other people´s IP and trying to pay the least (preferable nothing) for it part of the industry culture?
As you´ve mentioned Apple, the recent settlement between Apple and Qualcomm seems to to be a good example; of course you could argue that this time the system finally worked but ....
The system imo works in favour of the participant with the highest level of power and or strongest financial resources, so complaining about another one doing the same seems to be a bit odd....
What you say seems an evidence to me. All the things humans can discover are the product of the "culture" of the humanity. And, so often, people that patented something were not the first to had imagined-it.
Of course, there is a need for inventors to can live from their ideas. The work has to be paid, as well as the industrial investments, one way or an other.
But it seems that the way the patents system is working nowadays in western countries is totally abusive. Patents are a way too expensive, not within reach of individual, big capital wins always against simple individual.
And, looking at this, it is a break from the progress of the knowledge and technology of the humanity.
On a sociological point of view, it is only a balance of power. As it seem obvious that the world leadership is leaving the United States in the direction of China (It has always been this way in the history of civilizations), China impose its own rules, as US did since the end of the last mondial war.
the only way I think that can reverse the process is a new world war. It does not feel like it. God have mercy on us.
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200W amplifier balanced input connected to the Benchmark DAC2 and plays flac files from laptop.
I am very satisfied with the result, it surpassed all my expectations, balanced inputs work flawlessly and that is first time I tried it except in simulation.
The whole amp is exact copy of the simulated model, nothing changed.
Fast circuits, current on demand, sophisticated compensation, and voila "perfect" amp
Weight 16 kg of pure sound.😀
Damir
I am very satisfied with the result, it surpassed all my expectations, balanced inputs work flawlessly and that is first time I tried it except in simulation.
The whole amp is exact copy of the simulated model, nothing changed.
Fast circuits, current on demand, sophisticated compensation, and voila "perfect" amp
Weight 16 kg of pure sound.😀
Damir
Attachments
That's about it, but the tools available are very sophisticated and include 3D multi-physics extraction of parasitic elements when needed.
Yes, but again the tools we have are extremely sophisticated and flexible and sometimes we still need to build devices from scratch and get the process folks to agree that they will work.
We spent $$$$ in licensing fees every year for software as well as having a large CAD support staff.
Good to hear that you are happy with the result. However, you could use a better dac if you want the best sound coming out of your amp. Will that be the next project?
So true.
At my last place of work, there's this guy from legal, J., a fine engineer himself and holder of a patent, whose daily work was to engage in conversations that go something like this:
J.: " Look, I've got these 321 patents that may be of interest to you, I'm ready to exchange against those 123 of yours that I want."
The competitor: "Deal"
Thanks a lot, Scott. I want to say I admire you way to synthesize the questions and answer them with as much simplicity and accuracy.
I reached to a conclusion: We can forget now all our passions for DIY (industrial or not) and become happy consumers of products that we understand little about.
The only thing that worries me is that the technical knowledge is now in the hands of a long chain of participants. Scary if we imagine that a disaster could destroy a single link of this chain.
I also conclude that here, we are like participants in a "survivors" TV program, trying during a week or two to make fire with bits of wood.
Or go fishing between two visits to the supermarket. ;-)
This DAC is a gift and I don't have money to buy better one.
Next project? I don't have enough knowledge in that area to put my fingers in it.
The Neaderthal guys and their hairy women disappeared, the Denisovan people disappeared...Do you miss them?
It's the same discussion there is about the Men of the old times, the stronger, tougher men...and the actual truth about it is that the modern sportsmen are simply ten times more powerful than the antics because we LEARNED how to make efforts COUNT! David and Goliath...
While J.C., with all my sympathy, continues to imagine his own furniture build by hand with pieces of wood from another age, I am aware that, on my own, I have passed from discrete components, assembled by me ... to integrated circuits, then to pre-assembled cards with SMDs that I can only see with difficulty.
I'm going to the sealed box , moaning when a cable is not delivered with the product.
I bought a ChromeCast streamer. Had no desire or even curiosity to open this pebble.
I can die in peace.
I'm going to the sealed box , moaning when a cable is not delivered with the product.
I bought a ChromeCast streamer. Had no desire or even curiosity to open this pebble.
I can die in peace.
I only listen to music when modding or fixing my toys...for the rest of the days i prefer birds singing, waterfall noise, the crickets in the grass...you know, the simple beautuful sounds of nature.
Well, when I see a hairy women in the street, I wonder if I'm so different than them. (you can replace "I" by "we")
Ha ha, on my side, It is listening to music that makes me modding or fixing my toys.
When i hear somebody telling: don't listen to recordings, go to a live concert, much better experience! i just feel like laughing...the whole world is a fabrication, our fifth opposable finger that made the violin is a nature fabrication, the future AI that will replace us is a nature's fabrication...we are just slaves of the technology, not the other way around .We can only escape in our past nature , extending the time scale and go backwards!
There's nothing interesting in the future for us, cause future is always replacing us with new...US!
I understand JC a lot...living in the past is actually the best thing we can do for ourselves.
Just don't sell it too high cause i don't want to go again in the future to pay for an expensive past!
I watched carefully what both Parasound owner and the new CD-player in town guy said in those interviews and what they really think of is that they can buy a new Ferrari if we buy their past and best technology to listen our old records in our tiny little rooms behind 4 walls.
They blamed the new generation for consuming cheap audio...Well... listening to some in ear headphones on an ipad or a phone can happen while touring on a bike around the world enjoying the nature and seeing other places and people.
There's nothing interesting in the future for us, cause future is always replacing us with new...US!
I understand JC a lot...living in the past is actually the best thing we can do for ourselves.
Just don't sell it too high cause i don't want to go again in the future to pay for an expensive past!
I watched carefully what both Parasound owner and the new CD-player in town guy said in those interviews and what they really think of is that they can buy a new Ferrari if we buy their past and best technology to listen our old records in our tiny little rooms behind 4 walls.
They blamed the new generation for consuming cheap audio...Well... listening to some in ear headphones on an ipad or a phone can happen while touring on a bike around the world enjoying the nature and seeing other places and people.
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