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Old 29th January 2012, 11:30 PM   #4981
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Auwaia, JimT's tubed SymaSym looks niedlich (no good word in English)

(and again, tolle Frisur, Mr G)
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Old 29th January 2012, 11:30 PM   #4982
RCruz is offline RCruz  Switzerland
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Originally Posted by Holger Barske View Post
For those of you who wanna have a glimpse at what has taken place at the Frickelfest light: Endspiel
You may also spot our ATL contact guy Frans .
Was a pleasure to meet you, Frans, hope to see you again.
And I have to agree to Joachim: We had a really fantatstic sound. Apart from that, it was great fun and lots of interesting people.
Great warm up for the big Frickelfest in June.
I am speachless .....
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Old 29th January 2012, 11:38 PM   #4983
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I plan a gathering anyway where we all come together and listen.
If it's on this planet, count me in



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Old 29th January 2012, 11:47 PM   #4984
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It is in one of the ATL labs, it is on this planet but well hidden. Slightly shifted in time.
Ricardo, we need Frans on that but i would say 40V is a bit too much.
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Old 30th January 2012, 01:54 AM   #4985
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When i look at Ricardos and Samplers solution, Ricardo keeps the "bass" resistor whereas sampler keeps the caps with only a small change to the "treble" cap. Samplers solution is easier to implement. They give slightly different gain. Ricardos is louder i think.
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Old 30th January 2012, 02:09 AM   #4986
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This is an interesting paper on low level distortion in BJT transistors :http://www.essex.ac.uk/csee/research...distortion.pdf
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Old 30th January 2012, 09:29 AM   #4987
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Thanks Joachim and Holger for details and photos. It must have been nice meeting!

I also missed somehow 2011 ETF photos - also some of these are inspiring! Thanks for reminder Joachim. Nada from Klang Ton is something similar to what I use everyday. Mine is slightly different scan drivers and enclosure - also very thick/stiff and well damped. Still in 'prototype-like' build, but the sound is very fine. Not my design but seemed well designed and works as advertised. If only I knew Nada maybe mine choice would have been different... I use Scan kevlar midbass drivers which are way better than those used by Bowers - though you can here that people complain in general on kevlar drivers...
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Old 30th January 2012, 09:49 AM   #4988
FdW is offline FdW  Netherlands
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What about the 40Vraw psu ?
The 40V raw DC is fine for me, we need 24V for the preamp, this gives 16V for the regulator to play with.

The current source is using up 5V and the voltage source needs 4V at the least, 5V is best (I think).

From this we can conclude that the minimum raw DC needed is 34V (optimal 35V).

And that leads to a transformer voltage of:
(35V + 2V(rectifiers)) / sqrt(2) = 26.1V (this will also vary a bit with capacitor size).

The minimum transformer voltage is thus 25V (using schottky rectifiers) but it is on the low side for the voltage regulator, you van improve this a bit by using a one step lower voltage zener on the current source (in the schema 6V2 but may be lowered to 5V6).

The power disipated with 40V raw is (40V - 24V) * 300mA = 5.3Watt, that is 2.65Watt per mono side, the selectected heatsink kan handle that easy.

Maybe Hessener can comment on that (the temperature of the heatsink).
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Old 30th January 2012, 10:43 AM   #4989
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Hello guys,
yes i have to agree, it was a great pleasure to meet again all you brilliant guys.
Because i am an electric fool, the only way to contribute anything
to us was this;
Click the image to open in full size.
the world feared cucumber-pineapple salad.
Even the setup sounded great.
Very relaxed room filling smooth but with enough energy to fill the space where needed.
Thx to all who made it happen.
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Old 30th January 2012, 10:56 AM   #4990
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Where's the bleeding pineapple, F...

B.A. BARACUS, FOOL! - YouTube
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