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Old 14th May 2013, 10:56 PM   #7211
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Quote:
Originally Posted by BMW850 View Post
Hi Tibi,

Are you going to do a group buy in the future in connection with a 5 volt super regulator special for V1 V2 V4 V4 ?
Maybe the simplistic Salas low voltage shunt regulator is a good choise with transformer on the board?
See photo as an example ...

Regards,
Rudy
SSLV is layout sensitive and any layout other than the BiB has to be very carefully evaluated and measured.
I would stick to BiB and forget about chinese ebay stuff
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Old 15th May 2013, 08:27 PM   #7212
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My latest attenuator experiment is crystallizing

Click the image to open in full size.

~14dB attenuation, 75R in 75R out impedance

Dale RN60 in T configuration (50 series, 32 shunt, 50 series)

Later I ll post both metrics and audio impressions
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Old 15th May 2013, 09:44 PM   #7213
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OK some days it seems that someone is trying to screw up everything you do... like EVERYTHING....
Since the time I woke up today, nothing I do seems to work for some silly reason that renders my entire effort worthless...
And I mean EVERYTHING... And not 2-3 times... like about 20 times since the time I got to work.... The latest one that is relevant here, is that Mouser screwed up the resistors, and instead of 32R4 they sent me 374R...

So the attenuator is worthless... and of course I have no other ~30R resistor... I could try winding one out of res wire, but I m pretty sure that this will get screwed up somehow too...

I m going to sleep
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Old 16th May 2013, 10:07 PM   #7214
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A bit better today.

I made the 14.2dB attenuator using resistance wire and sealed it into wax/wenge. I also used a new technique which should have lower inductance and far less vibration and temperature noise.

The measurement of the output signal is now spot on, showing an accurate 500mV peak to peak perfect square with nice and fast rise time and no ringing.

Click the image to open in full size.

Below is the previous measurement with the 12dB attenuator and probably higher inductance resistors.

Click the image to open in full size.

It's late now to make any audio tests... I ll leave it working for a few hours and audio test it tomorrow.

Anyway, my thoughts are verified... To get the 0.5V output we need a 14.2dB attenuator. Now to see how it sounds...
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Old 16th May 2013, 10:54 PM   #7215
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dimkasta, that is about as perfect as you can get. Congratulations. You'll have to tell us how it sounds!
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Old 17th May 2013, 07:40 AM   #7216
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I did some listening today before leaving for work. First impression is that music has much much much more power to it. Attack power and speed of drums is amazing, while mids have much bite and energy without losing in detail.

I could easily wrap the transport up now and never think about tweaking it again
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Old 17th May 2013, 08:20 AM   #7217
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By the way, now that I think of it, the fixed square could also be because of the optimization of the Salas PSU.
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Old 17th May 2013, 09:20 AM   #7218
BMW850 is offline BMW850  Netherlands
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That's the trap too many modifications in succession.
It's happen also to me with the elco adjustments to the board and the ALWSR + 5v Built- & Tested Regulator all at once.

The most beautiful is a second original Vicol Shiga board if there is an improvement with the modified board, then change the original Vicol Shiga board.
Old pictures, Shiga on the Workbench

Regards,
Rudy
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File Type: jpg P1010376.jpg (98.5 KB, 156 views)
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Last edited by BMW850; 17th May 2013 at 09:26 AM. Reason: Typo
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Old 17th May 2013, 11:36 AM   #7219
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Originally Posted by dimkasta View Post
By the way, now that I think of it, the fixed square could also be because of the optimization of the Salas PSU.
I read through your posts in the Salas thread. Perhaps you could summarize here what you did to both the Salas, and to the Shiga when coupling the Salas to it, to optimize things.
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Old 17th May 2013, 11:55 AM   #7220
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Salas psu is quite versatile and can be quite different with different parts. I used 47uF electrolytic on the Zobel with 0R47 because the pana FR is low ESR, 47uF on the sense lines right on the BiB board and 1000uF electrolytic on the entrance of the psu on the shiga board (V4)
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Last edited by dimkasta; 17th May 2013 at 11:58 AM.
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