I have a similar problem but I've noticed that it only occurs when a household device that has a large current draw on the mains (an iron for example)is switched on or off that it makes my Buffalo32s drop out like yours for about half a second.

It would seem to suggest a grounding problem but I can't find anything amiss, I assume that you've joined the L1 and L2 pads on the Buffalo?

Anyway try switching a soldering iron or domestic iron on and off too see if it's that - maybe I've just got dodgy mains around here!

Cheers

Yes I didn't have the problem on my Buff24 either only on the Buff32......strange.

As I wrote earlier, it is the same household electrical situation in my house while the Buffalo 24 played before and the Buffalo 32 is plying now, nothing is switching on and off, definitely not few times a minutes. I need to test it further. It's a 4 meter coax cable from a Satellite TV setbox (which worked fine with Buffalo 24). I'll try 1 meter cable from a CD player and also toslink.

I have somehat similar behavior to what Pelliot123 is seeing. The lock light flickers every 10-15s when the Buffalo32 is powered on but everything else is off.

Once in a while the DAC even makes a chirp when the amp is turned on.

Cheers

Thomas

Problem partially solved.

The Buffalo32s seems to be more sensitive to HF interference than the Buffalo 24, while Buffalo 24 is fairly sensitive to such interference.

My solution took few steps.

1. 0.1u capacitors were added to the power supplies (analog and digital), in parallel to C5, C6, C7, C8 C9 and C10.
2. 0.1u capacitors were added right at the DC in (parallel to ground) of each of the boards. That is, VA and VD on the Buffalo board and all other digital boards, especially CS8416 Mux.
3. All the leads from the power supplies to the various boards are screened. I used an old cheap interconnect cable for that.

Now the Buffalo32s behaves much like the buffalo 24 did, without any tweaks. That is, it's basically stable, other than the sync is being lost whenever a light bulb is being turned on or off anywhere in the room. This is still not good enough, for no one of the other, commercial, DACs I have is that sensitive.

Those are my suggestions.
1. There would better be an option to add 0.1u capacitors in the places I mentioned on the various power supplies, including placid and at the DC in of all other boards, including various DACs.
2. In a possible new layout of Buffalo32s, and/or in the layout of the tweak Buffalo32s (the one without I/V), there would better be provision to add a shield, covering the LD regulators, the crystal and may be also the DAC chip.

Edited by user Friday, October 2, 2009 10:55:08 AM(UTC)  | Reason: Not specified

Yes, a shielded iron case from an old equalizer.

Well it would seem I've managed to stop this drop out problem by shielding the analogue power leads to ground.
Instead of using the twisted + and - pair :) plus ground wire I just removed the ground wire and threaded the + and - twisted wires through some copper braid to ground instead.

Since then I haven't had a single drop out and it is now totally stable.

Strangely it doesn't appear that the digital power leads are effected just the analogue ones.

Hope this helps others with the problem.

Cheers

What was the result of the demo ?