Torpedo
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Posts posted by Torpedo
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Hitoridekimasu came to my place and we implemented on the B22 a switched attenuator which allows to choose to leave its 8x gain untouched or drop it down to 1.5x (more or less). Fantastic results
now I can listen to the PS-1 and other sensitive cans at comfortable levels having the volume pot away from its unbalanced lowest range (right channel louder than left one) and where it allows very fine loudness adjustments. Surprisingly, perhaps for the pot working in a range where it's more lineal or has better channel balance, it sounds a tad bit more open.Thanks to Nate and Birgir who suggested the solution, and to Ti who provided the circuit diagram. Hitori calculated the resistor values to have the gain at the desired level. This B22 sounds damn good
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How much raises cost having the controller board for monitoring temperature, selecting source and controlling the volume stepped attenuator compared to mounting a good volume pot and analogue selector switch?
Not very worried about the raw cost, but for the noise and additional circuitry and complication it means.
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^
Funny -
Definitely, if it weren't for my friendship with PICaudio (Rodrigo) I could only participate in the non-Diyer version which just required soldering a few connectors and screwing boards in place. But I think this was the original idea, that people not being skilled DIYers themselves could get the tough work done by someone else, while the pure DIYers could get every single bit and piece apart to build the whole thing by themselves.
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Very Happy Bday
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It's not very much what I can comment or help since my boards would be built by PICaudio and somehow my participation is linked to his willing to stick into the project. I believe the built amp would be worth those 1300-1500 bucks, probably more considering the prices commercial products carry. Still a lot of money and we'd have to clear up a few things yet. Maybe we'd need to know how many of us are still in it, and if most people want to build their boards and PS or having them built by someone else but mounting them into a chassis, or even if some prefer having the whole thing built by other person. Also if we'd have the same enclosure for all to make cost lower (which maybe wouldn't be that interesting for the ones of us living outside the US), hence if everyone wants a single chassis amp or prefer a two chassis one.
It also would be good knowing if everyone will use S22 power supplies or someone is willing to build the original PS Kevin designed for the Dynafet.
Once we know all this and have a recount of all variables we'd see if it's still feasible.
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Ouch. Sounds like a nightmare all around. That must be a very difficult part of being a doctor.
Yes and no. It's very sad and quite tough when you face the moment of realizing nothing else can be done, and telling so to the relatives or the own patient. But it also has a good part which is reminding you how damn lucky you are. Kinda makes you appreciate better what you have and enjoying it while you have it.
Who knows, maybe this little girl can go through a few weeks more and in the meanwhile a kidney for her arises.
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Yep, the poor wee girl has other conditions which don't help to let her grow up as much as she should. She'd need a kidney transplant to survive. Life sucks sometimes
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Couldn't find the exact match, the most likely candidates are the 4101-NT or the 4101-SPL-NT Look very nice, with rosewood fretboard, sapelli sides and back... one seems a dreadnought with spruce top and the other a classic shape all in sapelli (Entandrophragma cylindricum, whatever it is in English), so I was wrong in my reference coding guess.
I hope she likes the guitar
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Made a tracheotomy on a 9 month old, 12 pounds weight baby in the yesterday on-call shift
Fortunately she had a secured airway, otherwise it had been a real nightmare. -
I'm late. Happy belated Birthday, or should it be belated Happy Birthday?
I hope you had a great one mate. -
I think it should be a Gold Formosa. Those guitars are manufactured in Taiwan. Have been searching their website but couldn't find the 4104 model, though they have others being quite close like 4101 and 4102. Not sure about their model coding, but seems 41xx are dreadnoughts.
Maybe you can contact them and asking about it.
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The pre-emphasis was something they designed to "prevent" a damage to the high frequencies for the use of brick wall filters in the early RBCD era. It's just EQ and can be reverted by applying the same curve as it's done for the RIAA curve in vinyl. I read somewhere that the EQ curve comes from applying a time constant of 15/50 μS depending on frequency. In fact I've found the source of that and I post here what someone who seems knowledgeable wrote about it:
In a nutshell: to generate the correct target 15/50 -
Hey, that castle is in Manzanares el Real, a village at about 40 miles from Madrid. I used to spend the summer holidays there with my grand parents when I was a child. World is damn small hahahaha. Funnily enough in that town and the mountains around some Hollywood movies were produced. I think Charlton Heston's "El Cid" was filmed over there.
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Hi Everybody,
Just got home from four days in the hospital. I had a hemothorax too and needed a chest tube. I'll write a more detailed post once the animals get their attention.
Thanks again to everybody for the help you gave me. It all helped a lot.
Glad to know you received attention in time. Get better 
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Happy Birthday mate
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Great, thanks a lot mates
I'll let him know. -
Cool, I'd like knowing your thoughts about the CD/SACD performance and also as a transport. If it made a good CD transport I could use it instead of the CEC and getting SACD playback as a bonus. Not a big fan of SACD myself, but I have the hopes it's just because I haven't found a good enough player yet. I could start collecting the Hoffman remasters of Blue Note
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Hi Azazel
What did you get today, the magazine or a XA-5400ES? -
Ok if no one is against it, then I
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Sorry to read that mate. PICaudio and I have a friend who is very interested in the project. He would take 4 boards and would build them, so he wouldn
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I just placed an order for all the parts needed to build the Poor Man stat amp. Now we'll see if it is possible to build an amp for less then 300$...
As far as it sounds like a 717 or better, I'd like one for my first flirt with O2. Make it small please
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Have any of you heard from Ken? I hope he made home and is fine. If someone has news please share.
now I can listen to the PS-1 and other sensitive cans at comfortable levels having the volume pot away from its unbalanced lowest range (right channel louder than left one) and where it allows very fine loudness adjustments. Surprisingly, perhaps for the pot working in a range where it's more lineal or has better channel balance, it sounds a tad bit more open.
Funny 
Fortunately she had a secured airway, otherwise it had been a real nightmare.
What did you get today, the magazine or a XA-5400ES?
Group Build: Dynafet
in Do It Yourself
Posted
Thanks for the comment j4cbo. If the controller board compares that favorably price wise and includes the resistors for the volume control, it makes sense. However dealing with smd soldering can be a problem for some. Maybe leaving that optional if possible might be interesting.