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Old 24th June 2013, 10:13 PM   #1651
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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!
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Old 25th June 2013, 08:30 AM   #1656
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let me ask practical question:
might the vssa be connected to signal source direct without input cap?
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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 ?
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Old 25th June 2013, 12:17 PM   #1658
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no, because of base current... :-/
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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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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

Cheers!

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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