I doubled checked Rudi and they are correct now. Thanks for the illustration though. That helped confirm it.
Gentlemen, I have transferred my current "BlackBeauty - SYMASYM - Layout" to BirgerM., who owns the German diy-audio-shop.de - Platinen und mehr für Jedermann.
As Birger told me: he will be able to offer you the SYMASYM-PCBs (I do not know, if he will offer you "any hard-to-get-components") by the end of June.
I myself have grown too old to do group-buys anymore, doing too many commercial errors, ...
Best regards - Rudi
As Birger told me: he will be able to offer you the SYMASYM-PCBs (I do not know, if he will offer you "any hard-to-get-components") by the end of June.
I myself have grown too old to do group-buys anymore, doing too many commercial errors, ...
Best regards - Rudi
Attachments
I didn't see a Rev # on that board, but it looks to be slightly different then the ones I have. Next generation perhaps? I'll take a closer look tonight. Is there anything 'significant' I should change on the original BlackBeauties that impact the sonics in a real audible way? I'm just a few days away from applying power and adjusting things. Maybe this weekend. My enclosure is due to arrive via DHL tomorrow.
Rick
I need a bigger chassis!
My enclosure showed up today so I'm now looking at my layout options. I had my doubts about the size of this chassis, and as you can see there won't be much room left over. I had intended to build Rudi's, media amp that will include other modules, but now may take a different approach with the Black Beauty amp.
This enclosure, the B32120 from along is very nice and solid and provides plenty of HS space. But just enough room for a 500VA toroidal and the Black Beauties. Maybe I'll use it for my Honey Badger instead. 😉 BTW, I don't mind putting in a shameless plug for along's eBay store. One of the best vendors to work with.
Rick
My enclosure showed up today so I'm now looking at my layout options. I had my doubts about the size of this chassis, and as you can see there won't be much room left over. I had intended to build Rudi's, media amp that will include other modules, but now may take a different approach with the Black Beauty amp.
This enclosure, the B32120 from along is very nice and solid and provides plenty of HS space. But just enough room for a 500VA toroidal and the Black Beauties. Maybe I'll use it for my Honey Badger instead. 😉 BTW, I don't mind putting in a shameless plug for along's eBay store. One of the best vendors to work with.
Rick
Attachments
What does the chassis coding mean?
B32120: is this centimetres ext width and ext depth (back to front)?
What are the internal dimensions?
B32120: is this centimetres ext width and ext depth (back to front)?
What are the internal dimensions?
Andrew, these are the dimensions of Rick's case:
External dimension: width=320mm Height= 120mm depth = 311mm
Internal size: width=220mm Height=112mm depth = 300mm
Front panel thickness 10mm.
Best regards - Rudi
External dimension: width=320mm Height= 120mm depth = 311mm
Internal size: width=220mm Height=112mm depth = 300mm
Front panel thickness 10mm.
Best regards - Rudi
If you click on the link there are some better pictures and full specs of the chassis. It is offered with either blank panels or pre-drilled. The internal height is about 2.5U.
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Rudi,
One clarification... C47-C50 are labeled 1000mfd on the silkscreen, but 470mfd on the schematic. Which is correct, or does it matter? Any value between 470 and 1000? Also, what's the power rating for these 4 caps?
Rick
One clarification... C47-C50 are labeled 1000mfd on the silkscreen, but 470mfd on the schematic. Which is correct, or does it matter? Any value between 470 and 1000? Also, what's the power rating for these 4 caps?
Rick
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If You look on the schematic see that they are connected on the positive and negative rails so minimum voltage is the rail voltage for this sitiation 50v caps will suit. 470uf is ok but 1000uf sounds even better as local power reserve.
Rudi,
Just to be clear on this post and the original layout (Rev 2). What value should R40 and R42 be? AndrewT suggest they are too low to be effective. Is that your opinion as well? Can they be left off, or should I stick with 1R0 Ohm resistors? Wattage for those?
Thanks,
Rick
C47 to C50 look like they are MF local decoupling on the supply rails next to the four biggest current consumers.
They need to exceed the absolute maximum supply rail voltage, plus a little bit for mains spikes passing through the PSU.
If you have a 50V cap and run it on 49Vdc, it will last virtually forever, if you keep it cool.
If there are mains spikes, some may exceed that 1V you have spare. Any spike that exceeds 50V has a risk of removing a tiny bit of aluminium foil inside the capacitor. A million spikes a day each exceeding that 1V could remove a million little bits of aluminium foil, i.e. the cap has a limited life. You can increase the life by stopping, or attenuating, or reducing the number of, spikes that exceed the cap's maximum voltage.
Or you increase the caps maximum rating.
There is nothing wrong with running a 50V cap at 49.999V, nor with running a 35V cap at 34.999V
They need to exceed the absolute maximum supply rail voltage, plus a little bit for mains spikes passing through the PSU.
If you have a 50V cap and run it on 49Vdc, it will last virtually forever, if you keep it cool.
If there are mains spikes, some may exceed that 1V you have spare. Any spike that exceeds 50V has a risk of removing a tiny bit of aluminium foil inside the capacitor. A million spikes a day each exceeding that 1V could remove a million little bits of aluminium foil, i.e. the cap has a limited life. You can increase the life by stopping, or attenuating, or reducing the number of, spikes that exceed the cap's maximum voltage.
Or you increase the caps maximum rating.
There is nothing wrong with running a 50V cap at 49.999V, nor with running a 35V cap at 34.999V
I can't find R40 & R42.
Are they in post1254?
Found them is the layout.
You don't make it easy for us !
Use quasimodo, or similar, to determine the snubbing resistance required for each transformer winding.
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Can I reppace the 22k resistor (LsProtection) with a 20k resistor? The 22k resistors are sold out.
22k is a standard value in the E6, E12 and E24 ranges.
If they don't have it, then try getting your resistors from a different retailer that holds stock of the E24 range from 10r to 1M0
see rapidonline.com
Their 600mW 1% metal film are a good general purpose resistor. From Truohm, Vishay and recently Royal Ohm.
If they don't have it, then try getting your resistors from a different retailer that holds stock of the E24 range from 10r to 1M0
see rapidonline.com
Their 600mW 1% metal film are a good general purpose resistor. From Truohm, Vishay and recently Royal Ohm.
For that position 20k will do. Or You put 20+2k in series, anyway is not a critical position regarding value.