Rank: Member
Groups: Member
Joined: 11/15/2010(UTC)
Posts: 36
Location: Hungary
Thanks: 1 times
|
Hello! I have an interesting problem. When I turn the dac on for about 6 minutes the music is clipping randomly. (in about every 10-15 seconds, but as I said very random) When I hear a "clip" in the music the lock led goes off for half of a second. Also one of the leds on the mini regulator is dimming (the right led on the picture). When everything is warmed up the regulator led becomes steady. Measured voltage on the Placid is steady 5.45V all the time. I tried increasing the current, but nothing changed, only the Placid got real hot.  It's not a major issue, because audio gear sounds bad at a cold start anyway, I'm just afraid if this behaviour is safe for the dac in the long run or not. Thanks, G Edited by user Thursday, January 27, 2011 7:34:21 AM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 2,868
Location: Massachusetts, USA
Thanks: 2 times
Was thanked: 141 time(s) in 134 post(s)
|
Can you measure the output voltage of the AVCC regulator, before, during and after the warmup? That may help pinpoint what it happening.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/15/2010(UTC)
Posts: 36
Location: Hungary
Thanks: 1 times
|
Atm after many hours of it's being on it's very stable 3,46. More measurements later.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/15/2010(UTC)
Posts: 36
Location: Hungary
Thanks: 1 times
|
Ok. There is minor fluctuation 3,46V to 3,48V, as it gets warmer the fluctuation becames less apparent and then totally gone. (I'm using a hiface and the sampling rate is 192khz all the time)
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/9/2007(UTC)
Posts: 453
Location: usa
|
That fluctuation is normal. That's the LED reference thermal behaviour/drift. Does lowering the sample rate to 44.1K make the unlocking go away?
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/15/2010(UTC)
Posts: 36
Location: Hungary
Thanks: 1 times
|
glt wrote:That fluctuation is normal. That's the LED reference thermal behaviour/drift. Does lowering the sample rate to 44.1K make the unlocking go away? I will try that, but you know this is sort of a windows 7 setting .. :)
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/9/2007(UTC)
Posts: 453
Location: usa
|
Hi,
The reason I say this is because of my latest experiment (which I have not yet reported)
Previously I was able to get rock solid locking with spdif and DPLL set to "lowest", no matter whether the DAC is "cold" or "warm".
with 192K sample rate, sdpif input and DPLL set a "lowest", I experience unlocks until the DAC warms up.
That is not really a big problem for me because I can set the DPLL to any value I wish.
If you switch to lower sample rate and do not experience unlocks, then it is possible the DPLL setting is the reason for the unlocks.
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
such things can also happen from external influences such as a ground spike from an appliance or heater turning on and off.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/15/2010(UTC)
Posts: 36
Location: Hungary
Thanks: 1 times
|
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/15/2010(UTC)
Posts: 36
Location: Hungary
Thanks: 1 times
|
I tested it with 16/44,1 and there was no clipping. :) Now I just gotta figure out a way how to make 192 work on windows7 without upsampling everything to 192. Edited by user Thursday, January 27, 2011 4:02:59 PM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/9/2007(UTC)
Posts: 453
Location: usa
|
|
|
|
|
|
|
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
