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A miniSharc / Buffalo III 8ch prototype 9 years 2 months ago #11184

  • Crumboo
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Hi,

I just wanted to share some info on my build. It is supposed to be a combined active crossover/dac/preamp. So far I have put together a rough box:

[

Apart from the miniSharc and BIII, I have also made a small controller (picaxe) driving a OLED display and a relay for standby mode. A Placid HD from Twisted Pear is powering the dac and their LCDPS is used for powering miniSharc and the controller.



For the time being, I only have one input (the Toslink adapter from TPA) so I have to switch cables from time to time.... :whistle:
I havn't yet been using all outputs yet since I need to replace the old analog crossovers in my speakers with power amps first... :blink:

Best regards,
Mattias

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A miniSharc / Buffalo III 8ch prototype 9 years 2 months ago #11200

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Mattias,

Wow, that's an impressive setup you have here! Very cool... You did combine buffalo + miniSHARC which is one of the first complete setup we can see here..
Great work!

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miniDSP, building a DSP community one board at a time.

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A miniSharc / Buffalo III 8ch prototype 9 years 2 months ago #11215

  • pos
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Great build!
That is exactly the stup I would like to build, but I definitely lack the electronic skills to implement and troubleshoot this myself, especially without proper I2S cabling and directives (Devteam ? :P )
I do have a B3 and power supplies ready, as well as a miniSHARC (well, it sits inside a fancy box called "openDRC" right now :D)

I see that your output cabling goes directly from the B3 to the XLR. No plan for I/V stages? How does it sound that way?
I/V is complicated with a 8 way setup, so if this can be avoided that is good news.

Is this a volume control knob on the front panel? Are you controlling the volume in the miniSHARC or in the B3 ?

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A miniSharc / Buffalo III 8ch prototype 9 years 2 months ago #11216

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Thanks for your kind words! :)

#POS: Actually, I am new to electronics myself so this have been taking some time. That being said, getting this together was actually easy! The one problem I had was that I had severe problems to connect and sync to miniSharc from the plugin. The reason turned out to be inproper grounding/reference between the parts (thanks for helpling me out devteam).

The I2S connection between miniSharc and Buffalo III wasn't any problem - simply connect the signal and clock pins. I haven't yet been using the I2S input to miniSharc however. I plan to use I2S sources later on, and the OTTO:II board from TPA for switching between sources.

As you noted, there's no I/V stages yet. It sounds really good I think, but then I don't know how it would sound with I/V-stage of course. As you say it's a bit complicated with a 8ch setup. I haven't really decided yet... :unsure:

The volume control is a stereo 10k lin pot. One of the channels is connected to BIII:s header and the other to my little control board (just so I can get a disply of the level). In the next (proper) build I'm thinking about using a motorized pot so I can operate it remotely.

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A miniSharc / Buffalo III 8ch prototype 9 years 2 months ago #11272

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Thanks for the update and please keep the community updated.. A very neat setup putting a smile on our face. :-)

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A miniSharc / Buffalo III 8ch prototype 9 years 6 days ago #12108

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I wish I can buy I2S adopter between MiniSharc and Buffalo III. Is there any plan to make such connector in near future?

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A miniSharc / Buffalo III 8ch prototype 9 years 6 days ago #12111

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Connecting the miniSHARC to BIII is easy, just connect the appropriate pins with some wire.

That being said, I made an adapter board that should arrive in a few days for use in my next build. Minimum order was 10 boards and I won't be needing them all so I'm willing to share. :) I just need to verify that they work as expected first!

Best regards,
Mattias

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A miniSharc / Buffalo III 8ch prototype 9 years 6 days ago #12112

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Good to hear that. Did you implement any buffer or reclocker or is it a purely passive adapter (which is completely OK to be honest ;) )

Best regards, Daniel

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A miniSharc / Buffalo III 8ch prototype 9 years 6 days ago #12113

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Crumboo, I am definitely interested?
What is the price? What is required to assemble them?

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A miniSharc / Buffalo III 8ch prototype 9 years 6 days ago #12114

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Its a purely passive adapter so I can skip the wiring and get a good ground plane for the signal and clock lines. I intend to stack the board onto the headers of BIII and miniSHARC using female headers mounted on the backside of the board. I'll put up an image as I get them.

pos: I'll keep you in mind. :) You just need to solder some female headers (2,54 mm pitch). I'll be happy to give them away for free if you pay for the shipping.

Best regards,
Mattias
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A miniSharc / Buffalo III 8ch prototype 9 years 5 days ago #12117

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Mattias,
I'm looking forward to it. Please sign me up for the adapter board!

Thanks,
Paul

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A miniSharc / Buffalo III 8ch prototype 9 years 5 days ago #12120

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I'd like to follow this thread because my plan is to use MiniSharc / Buffalo 3 to feed a pair of LX521 speakers. I'd like to implement 4-way crossover with linear phase instead of MiniDSP 4x10HD.

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A miniSharc / Buffalo III 8ch prototype 9 years 1 day ago #12214

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Are there any issues with using the balanced analog outputs of (4) AN-FPs to use all (8) outputs of the miniSharc? I've looked through the forum a bit but can't seem to find an explicit yes or no. Thanks !

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A miniSharc / Buffalo III 8ch prototype 9 years 1 day ago #12215

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You can only connect one AN-FP to the miniSHARC in the basic configuration since there is only one digital-I/O header. AN-FP needs some configuration via I2C Bus so connecting several AN-FP would probably need some at least some firmware hacking if possible at all. Better to use other solutions like 8ch Buffalo or 4 curryman DACs I guess...
kind regards, Daniel

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A miniSharc / Buffalo III 8ch prototype 9 years 23 hours ago #12220

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Thanks curryman for clearing that up. It would be great to see a module from miniDSP that allows all (8) balanced outputs to be used in a pro-audio environment, for example. But until that happens, other than the Buffalo III, are there any other DAC solutions I should be aware of? It wouldn't have to be a "pull out all the stops" kind of design, but relatively low noise is important. Any advice would be greatly appreciated!

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