To be fair to Jan the op-amp issue is a side show. The point solely is that a couple of op-amps in the signal path did not drive people out of the room with their hands over their ears. The exaggerations about how "obvious" these things are are tiresome.
THANKS for the link!! A useful addition to my library.
Lots o' nasty electrolytics in the mic preamp!
Nagra always had the BEST transports and servos in the world of analog tape. NOTHING would lock up to film or video better or faster than a Nagra.
Good engineers usually claim that sort of hearing limit.
However, in my experience, the exception is that when it sounds like yours, you know it instantly.
Remainder of context is at post #2523
A 200 watt amplifier used in a normal size home at 3/4 watt output, has excellent current headroom, a very level stability, and has far more power supply than the need (the charge recoup cycle, incurred from moving speaker cones, makes such a minimal impact that it doesn't degrade the audible signal).
As far as in-home use goes, it is also possible to equip a smaller scale amplifier with that much current resources, with all of the same results, including materials cost.
Exceptions:
A Nested/Composite amplifier, such as those at neurochrome.com don't require so much power supply expense, since the additional feedback loop forces power amp to copy audible aspects of the small signal amp, which is run on regs (not affected by the main supply's efforts at moving speaker cones).
Some error correcting schemes accomplish the same by different looking means; but, when they work, then the power supply current capacity doesn't need to be bigger than the amplifier capacity. They are still rare though.
Jan's gear didn't win him the contest, he did.
Give David Gilmour a Mexican Stratocaster and $50 SS Peavey practice amp and he will still be David Gilmour
Give David Gilmour a Mexican Stratocaster and $50 SS Peavey practice amp and he will still be David Gilmour
Interesting that the other finalist used a Stellavox, in many ways very similar in build, design and philosophy to the Nagra. But he used a dummy head with in-ear mikes while I had a pair of 1 inch condensor mikes.
His music selections were very much like mine though, and although I can't prove it, I believe that was the deciding factor.
Jan
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You are mixing up two separate fields you cannot do that, try and see please. its like trying to discuss relativity with a child...
The measurements and listening tests are for designing an electronic system to amplify a signal and drive a motor to provide a sound field emanating from two speakers, perception is in your head... Its how you interact with your world, you cant cater for perceptions with measurements have the last 20 pages or so passed you by?
WTF are you trying to say... I believe we are experiencing pointless trolling here....
I let him out of my ignore list last week because a fragment of a quoted post caught my eye.
This mistake has been corrected this morning 😎
Jan
This mistake has been corrected this morning 😎
Jan
I think you fundamentally are missing something, a cabinet makers hammer does not design the furniture. I didn't touch a meter or oscilloscope until the circuit Jan posted was built, but you might wonder where the 82uH inductor came from. 😉
When the occasional audiophile power amp blows up taking out your speakers one might wish the designer was more facile with his instruments.
Of course when I turned it on it oscillated, but I knew what to do. There have been more than one audiophile amp that oscillates on peaks into a difficult cable/speaker combination. Fixing the problem ears only seems a bit daft.
Is this thread going to become the next Blowtorch thread, not much of substance from the true believers it seems, just discounting that EE's and others who design with knowledge of electronics are just stupid to know what they are trying to accomplish. No engineer in any field I have been involved with has ever discounted basic theory, measurements and today computer aided design. Sure I can sit at my old fashioned drafting table and manually do a design but it surely isn't going to be any more accurate than I can do today with CAD, and with CAD I can do so much more quickly. The same is true in electronics. I just don't understand how the people with the least credibility have taken over so many threads with endless drivel about how engineers have cloth ears and no idea what they are trying to do. As in any other design endeavor garbage in garbage out. Of course it comes down to an engineer to use their brains and experiences to make the best design, that doesn't mean they will ignore what they have learned technically, it is what they base their decisions on. Just as a CAD system does not make a great designer I would say that something like LTSpice is just a tool to speed up and show problems, it doesn't design the actual circuit, that comes from the designers mind and past experiences. But to discount testing and known electronics and physics principals is what I keep seeing from those who want to believe in magic solutions to problems that don't necessarily exist. Max's magic telephone cable USB cords quickly comes to mind. Of course any of us who disagree about what is going on are just deaf, have no concept of great sound and don't know what we should be listening for!
Basically the answer is there is nothing wrong with opamps when use correctly and the concept of smaller devices being inferior to larger discrete devices is just another of those wishful thinking's of the true believer.
ps. Marce let me know how things are going with you, pm me, I'm glad to see you posting, just wondering the latest outcome? Best wishes for you and the family.
Basically the answer is there is nothing wrong with opamps when use correctly and the concept of smaller devices being inferior to larger discrete devices is just another of those wishful thinking's of the true believer.
ps. Marce let me know how things are going with you, pm me, I'm glad to see you posting, just wondering the latest outcome? Best wishes for you and the family.
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