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Hi
I assembled my Amanero-Hermes-Cronus Combo with 45.1584/49.152MHz clocks at the weekend, and it all worked fine! I’m feeding it from an Auralic Aries streamer, and into a Buffalo II. The Amanero is powered by an iFi 5V supply (very low noise)
Some time ago, as a supposedly temporary measure, I installed a RJ45 socket and a four way double pole toggle switch in my Buffalo. The RJ45 receives a DSD signal tapped from a Denon disc player. It’s wired to three of the poles of the switch; The fourth pole across the (now removed) SPDIF selector switch on the Buffalo. When the switch is operated, the SPDIF switch opens and the three DSD signals are connected to the DAC- I2s to SPDIF input switching. SPDIF and I2S grounds are both hard wired to Buffalo ground. The arrangement worked well with the disc player, even without Teleporters, letting me listen to SACDs, with only a slight transient “bang” when switching from I2S to SPDIF. With the Amanero Combo this is much worse!
How can I fix this? What’s the best way of introducing (for the moment) manual input switching of this sort to a Buffalo II? I have MUX II, and have ordered a Sidecar. The above arrangement- Cronus is linked to Buffalo by a ~100 mm Cat5 cable, hard wired to Cronus- works well up to 196kHz/ 24 bit PCM, but poorly with 356 kHz/24 bit, and not at all even with DSD64. Another reason to sort this properly.
BTW, the DAC and nothing connected to it is grounded to mains earth, though Buffalos case is. I use the balanced output from my I to V conversion stage
Thanks
Paul N
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Rank: Advanced Member
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Joined: 7/22/2009(UTC) Posts: 81 Location: Norwich, UK Thanks: 2 times
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Hi
OK, I’ve ploughed through some old threads, and it seems my switch arrangement is as good a way of doing this as any.
The switching noise seems to have lessened with time. I’m not keen to investigate systematically, as I’m not sure it won’t cause damage. But, with music playing, it was pretty quiet, and, thereafter, completely gone. I’m going to order a Buffalo III SE at some stage- though it seems they’re no longer available to even pre-order- correct?
The behaviour at 354 kHz may well, I now understand, be down to my 80 MHz clock, or voltage sag in an on board shunt reg- I presume Vdd? I’ll check for the latter.
The failure of DSD64 or 128 is a bit more worrying. It may be the wiring, but, as I said, DSD from a modded SACD player works well, and over a 50 cm Cat5 cable. With Amanero Combo, Teleporters would only shorten the path by 100 mm max.
Thanks
Paul N
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80MHz XO will limit the bandwidth capabilities. The Buffalo-IIISE will be available for pre-order again in the next week or so. A better way to switch between S/PDIF and I2S with the B-II is to use an external S/PDIF level shifter and supply D1 with TTL-level S/PDIF. You can then use an OTTO-II or similar to switch between S/PDIF and I2S, leaving the dip switch in the Off setting. Edited by user Tuesday, April 5, 2016 1:29:06 PM(UTC)
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I have done this with my b2 using an optical module (that outputs ttl level sp-dif) and an otto 2. Switching between I2s data on one side and the optical module on the other. I would think that you could use: "Single S/PDIF Level Converter Kit Converts one consumer-level S/PDIF or AES-EBU input to TTL-level S/PDIF Easily powered from Buffalo-III' VD supply" for this, but I am a bit confused as to why Brian did not suggest it 
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That's what I was referring to when I said "an external S/PDIF level shifter."
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Rank: Advanced Member
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Joined: 7/22/2009(UTC) Posts: 81 Location: Norwich, UK Thanks: 2 times
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Hi Brian, gwikse
Thanks for your replies. I need to decide whether to get a S/PDIF level switcher, and possibly a 100 MHz clock- or- more likely- a Buffalo III to replace the II, as it offers other advantages. Still concerned about my inability to cleanly play DSD files though. And is just the Vdd reg I need to check for adequate current headroom with higher res files?
Thanks again
Paul N
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Originally Posted by: Brian Donegan  80MHz XO will limit the bandwidth capabilities.
The Buffalo-IIISE will be available for pre-order again in the next week or so.
A better way to switch between S/PDIF and I2S with the B-II is to use an external S/PDIF level shifter and supply D1 with TTL-level S/PDIF. You can then use an OTTO-II or similar to switch between S/PDIF and I2S, leaving the dip switch in the Off setting. Hi Brain, Just want to make sure my understanding is right. You said "leaving the dip switch in the off setting"? while the manually all says: "Make sure the SPDIF switch is open" for all TTL level signals. Thanks, Roland
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Originally Posted by: sleep Originally Posted by: Brian Donegan 80MHz XO will limit the bandwidth capabilities.
The Buffalo-IIISE will be available for pre-order again in the next week or so.
A better way to switch between S/PDIF and I2S with the B-II is to use an external S/PDIF level shifter and supply D1 with TTL-level S/PDIF. You can then use an OTTO-II or similar to switch between S/PDIF and I2S, leaving the dip switch in the Off setting. Hi Brain, Just want to make sure my understanding is right. You said "leaving the dip switch in the off setting"? while the manually all says: "Make sure the SPDIF switch is open" for all TTL level signals. Thanks, Roland Just realize the "open" in manual actually means "OFF", while I take it as "open the light" which means switch on. :(
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Open and Off for a switch in electronics mean the same thing. :)
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"Open" refers to "Open Circuit"
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