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Old 24th June 2013, 10:13 PM   #1651
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Join Date: Mar 2009
Investing in wind mills in greece is very profitable i heard.
Maybe the guys in Brussels switch of the VSSA anyway.
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Old 24th June 2013, 10:15 PM   #1652
sonnya is offline sonnya  Denmark
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Ha ha.

Will they also shut down DIYAUDIO as well?? Those naughty guys!!!!!

They will set a statement starting with PASSDIY!!!! ha ha ha
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Old 24th June 2013, 10:18 PM   #1653
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No, the americans brought us germans democracy and gave the children chocolate.
OK; to be poor in the US with a serious health condition is a problem but there still is this proverbial dream of freedom.
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Old 24th June 2013, 11:54 PM   #1654
Renioo is offline Renioo  Poland
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Everything that LC would get from VSSA as a project belongs to him We could follow it from the scratch, discuss or more like me, learn from it. LC tips and wide explain of what-is-going-on gave me as a beginner a lot of knowledge. Moreover we learn everyday, so I think everyone learned something There is no reason to complain about LC's any move.

Mine VSSA is already ready for tests, but I have a question about calibration - why there should be a 22Ohm/5W (5W only?) resistor between PSU and VSSA power input and why we should measure it over resistor? It's first time I calibrate an amp this way, sorry It should stay only for calibration purposes I guess?
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Old 25th June 2013, 12:19 AM   #1655
asdiasx is offline asdiasx  Brazil
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Received my boards today here in Brazil! Very satisfied with the quality of whole package... No complains and hope LC can keep doing his good work supporting us!

Thank U!
Adriano Dias
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Old 25th June 2013, 08:30 AM   #1656
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Location: Krakow
let me ask practical question:
might the vssa be connected to signal source direct without input cap?
regards, Pawel
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Old 25th June 2013, 10:42 AM   #1657
atupi is offline atupi  Romania
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If your source has zero Dc (or near zero) output why not ?
Rega RP-1/Simplistic RIAA by Salas/ DCB1 clone/ MyRef Fremen Edition/FC-100/ XTZ 99.26 MkII speakers
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Old 25th June 2013, 12:17 PM   #1658
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no, because of base current... :-/
regards, Pawel
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Old 25th June 2013, 12:37 PM   #1659
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I got mine today.
Thank you Andrej
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Old 25th June 2013, 08:24 PM   #1660
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Join Date: Aug 2005
Default XVSSA?

Hi Andrej and diyAudio fellows.

Well, I still have to finish my JC-80 preamp until diving into VSSA build (shame shame shame), but having a non-productive day (with less power to solder and more to enjoy a seldom sunny day) I had something on my mind.

I was always impressed by the symmetry in LC's projects; I will have a JC-80 line amp, that offers a ballanced output; I have 8 Ohms power hungry loudspeakers. I have good feelings about simulations, anyway, I have no simulation programs installed, and more shamefully, I have no Schematic capture/PCB software installed

I was thinking first to use 2 VSSA modules bridged, with a phase invertor that can deliver out of phase signal to one of the modules. This can be a solution, but it ruins the symmetry.

I am now thinking of a balanced (X)VSSA, that could use the simplicity of this design and the output of JC-80. Of course, this is just a rough idea, and I tried to cover it in the attached picture.

Basically, I think that instead of running the ElCaps to the ground in the feedback nodes, we can maybe "X" them between two VSSA modules, so they will become a true balanced unit.

I am interested to learn if this looks valid and realistic. I thought I will better share this idea, because LC or somebody else can validate/improve it either by building or by simulation before it will reach my soldering iron - or other way of saying, rusting for years in my brain


P.S.: I will build the VSSA anyway in the next month, as I am sure it will be a major step forward, but I need to have a future next project
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