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BIII interruptions when switching off the room-light
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cubeasic  
#1 Posted : Wednesday, September 28, 2011 12:17:26 PM(UTC)
cubeasic

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Hallo,

I have encountered a small problem with my Buffalo DAC.
It is a BIII DAC with LCDPS and Tridents for the DAC Board.

It is sounding superb and really lets me enjoy my music, but every time I switch the light in my room OFF, the playback stops for about 1-2 seconds.

This happens every time and only with the buffalo. My other gear and previous DAC never showed this behavior.
Symptoms: No playback for 1-2 seconds, the Trident-LEDs stay on, but the lock-LED switches off for the time of the interruption.

Does anybody know what the reason for this behavior is? Is it a power supply thing or (since the buffalo is not yet cased) some RF-thing?

Thanks
Florian
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Russ White  
#2 Posted : Wednesday, September 28, 2011 2:33:32 PM(UTC)
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Yes this is almost always some AC bounce. Good grounding and a metal case can help with this quite a bit.

It can actually be an indicator that you may have some DC on your mains. Not unusual.
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steinholien  
#3 Posted : Thursday, September 29, 2011 3:34:12 AM(UTC)
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I have seen a similar "problem" on both my buffalo DAC's (B24 and B32S). Fixed it by putting a 0,1uF cap (X2) across the mains input.
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cubeasic  
#4 Posted : Thursday, October 6, 2011 11:36:58 AM(UTC)
cubeasic

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Steinholien, thank you for this tip.
To be honest, I don´t know where I should connect the caps to.

Du yo mean across the 220V AC Input? Why two of them?
Or after the regulators?

Regards
Flo
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glt  
#5 Posted : Thursday, October 6, 2011 2:11:36 PM(UTC)
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Not "two" but "X2" types. Search for "x2 capacitor applications"
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steinholien  
#6 Posted : Friday, October 7, 2011 10:19:13 AM(UTC)
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Yeah I meant X2 type caps. You only need one. Those are made for use in mains level AC circuits. Just solder it to the mains input connector, across the leads. Recommend that you put a resistor in parallell with the cap (high resistance, 1/4W) to discharge the cap.
If you look at this page: http://my.execpc.com/~endlr/line-filter.html

Halfway down the page you see a example scematic. The cap and res I described are C1 and R1.

Edited by user Saturday, October 8, 2011 7:16:31 AM(UTC)  | Reason: Not specified
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cubeasic  
#7 Posted : Saturday, October 8, 2011 4:18:04 AM(UTC)
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Thank you,
i will include a X2 cap in my next order from mouser and let you know if I succeeded.
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cubeasic  
#8 Posted : Sunday, January 22, 2012 11:50:43 AM(UTC)
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OK, unfortunately the X2 Cap did not work.
Still having this issue. but to be honest it is no big deal.

Or can the X2 cap be inserted "wrongly"?
I just put it across the two transformer primaries somewhere between switch and transformer. Together with a 1MOhm resistor.

Thanks anyway,
Flo
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steinholien  
#9 Posted : Sunday, January 22, 2012 4:24:52 PM(UTC)
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The best place to put the cap, is where the power enters your case. At the power entry receptacle. You can try to move it, but there may be another source for your problem. Russ tipped you about case shielding and possible DC on the mains.
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