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Old 31st March 2012, 06:18 PM   #1001
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Hi Sonorityand AndriyOL, - I am Also interested in how to connect and Correctly use an Isolation transformer Please .... can you start a thread maybe - where shall we meet to discuss this - Thanks Russ, sorry for the unintended threadjack ;-) Kind Regards, dean

Last edited by hallcon83; 31st March 2012 at 06:22 PM. Reason: forgot a name
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Old 4th April 2012, 07:59 AM   #1002
zoka959 is offline zoka959  Serbia
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Quote:
Originally Posted by Russ White View Post
Yesterday I let the cat out of the bag that after a year or so of careful design and testing I have in front of me Buffalo III. The fourth iteration of the Buffalo DAC, and while it is every bit a Buffalo, it brings with is a set of features that make it especially suited to the DIY enthusiast.
  • All 8 digital inputs and outputs are exposed in a neat modular way that makes adding input options very practical.
  • Any input format that the ES9018 supports is supported with jumpers on board to make for easy to join channels for 6 bit stereo or mono mode or keep them separate them for multichannel etc.
  • An on board port expander to make interface and configuration very practical for both on-board and off-board control.
  • An on board controller that supports volume control (same as Volumite) and SPDIF source selection (MUX) out of the box.
  • 16 switches for configuration or control. Some of these can be assigned to panel rotary switches for things like input selection.
  • It is designed to integrate with existing TPA output stages such as Legato 3.1 and IVY III.
  • It is designed so that each power supply is both local and modular with a layout that fits the Trident perfectly for an awesome combination.
  • It utilizes the same excellent custom ordered Crystek clock we have been using for Buffalo II.
  • The on-board controller even has its own local regulator.

Brian and I are in the midst of getting this unit into production. Now is the time you can influence the design of things like the on-board firmware. The hardware design is done and tested (and awesome) with a couple prototypes running now. I have been listening to this DAC for a few months, and it is a worthy successor to the Buffalo II.

Brian and I will be providing more design details soon, but we wanted to share the good news and get some feedback regarding the finalization of the on-board firmware.

Cheers!
Russ
Russ,
can I use lightspeed attenuator as a Buffalo volume control,because I have one on my previous preamp.It uses 10k pot.
Zoran
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Old 4th April 2012, 12:37 PM   #1003
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Sure you could, you would typically want to use it after the I/V stage. Still you would be far better off to use the built in volume control.
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Old 5th April 2012, 12:48 PM   #1004
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Now accepting pre-orders for the Buffalo, shipping the week of 7-May.
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Old 5th April 2012, 05:22 PM   #1005
LeonvB is offline LeonvB  Netherlands
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Brian, could you tell me what you think about the V1.2.3 manual I sent you?
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Old 5th April 2012, 10:51 PM   #1006
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Default A note about using both SPDIF and I2S

Users of the ES9018 and the Buffalo III in particular should be aware of a couple of facts.

The ES9018 has a SPDIF auto-detect feature. This auto detection is handy - but the detector can get false positives on very high sample rate PCM/DSD when the SPDIF multiplexor is set to a SPDIF input which is carrying a PCM signal. Whenever you know your DAC should be playing PCM/DSD you should *ALWAYS* disable the SPDIF auto-detect.

The auto-detect feature is especially prone to false positive on I2S data. This means when using sidecar that if you have the DAC SPDIF multiplexor set to receive either channel 2 or 4 (which map to D2 and D4 on DIN) it will *very* likely unlock the DPLL from time to time as it mistakes the PCM data for a new SPDIF signal and attempts to lock onto it in vain, only to once again soon re-lock on the I2S/DSD. This is especially true at high sample rates (192Khz and above).

The Buffalo III firmware exposes the SPDIF auto-detect register to the user using I/O B4. When B4 is high (default state - switch 2:5 open) SPDIF auto-detect is enabled. When low (same switch "on"/closed) then auto detect is disabled (or "bypassed" if you will).

If you wish to use the 2-bit selector to switch between 4 SPDIF sources (using the SPDIF4 module) and the sidecar to switch between I2S/DSD and SPDIF you should always pull I/O pin B4 low on the Buffalo 3 when you have I2S/DSD selected. The best way to do this is with dual pole single throw switch. One pole should be connected to GND and "B4" on the Buf III I/O header - the other to 5V and "B" on the Sidecar. In this way when PCM/DSD is selected SPDIF auto-detection is disabled. You also get to use all 4 SPDIF selections.

If you wish to use one of the SPDIF selections to switch to PCM/DSD instead (even with 2-bit selector positions 2 and 4) you can use a transistor (with a suitable resistor to the base) to pull "B4" low at the same time you trigger "B" on the Sidecar. Now you will only have 3 SPDIF sources and if you select I2S SPIDF will correctly be disabled.

I personally prefer the former approach to the latter.

I hope that helps out a lot of you folks trying to support both PCM/DSD and SPDIF at the same time.

Cheers!
Russ
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Last edited by Russ White; 6th April 2012 at 11:17 PM.
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Old 6th April 2012, 09:35 AM   #1007
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Hi guys
may i know the total current draw of buffalo III dac with all trident reg?

Thanks
erwin
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Old 6th April 2012, 09:58 AM   #1008
avr300 is offline avr300  Denmark
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Page 39 in the integration guide:

http://www.twistedpearaudio.com/docs...ide_V1.2.3.pdf
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Old 6th April 2012, 11:35 AM   #1009
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Thank you it's a very good information, connecting a wire between "B" on the Sidecar & pins 1 or 3 on the selector switch it's OK?

"B" on the Sidecar

Click the image to open in full size.

Attached position 2 or 3 selector switch
Attached Images
File Type: jpg selector.jpg (73.5 KB, 529 views)

Last edited by Russ White; 6th April 2012 at 11:18 PM.
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Old 6th April 2012, 11:45 AM   #1010
Turbon is offline Turbon  Sweden
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Now what's the best way to control this beast thru an MCU? Can everything be set from a MCU? No jumpers needed at all? No choises that has to be made before build it in?

Brgds
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