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Old 11th January 2011, 09:59 PM   #31
hotiron is offline hotiron  Scotland
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Default Mr super clean

Very strong contender, not sure yet, initial impressions are very strong.
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Old 11th January 2011, 11:48 PM   #32
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Quote:
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Bernhard you have my utmost attention and respect but what do you mean exactly by problems with timing? This sounds awesome the way it is, eg no TDA and no op amps ,
PS data and clock wires are less than 15mm.
Longer wires can cause trouble but if you have no problems, all ok

Film caps for decoupling on all power supply pins would be good.

You can try this integrated analog filter: passive I/V + 24 dB lowpass from 20 khz + hf rolloff compensation.
It results in equivalent of 100 ohm passive I/V so you may need some post amplification.
Connect nothing else to Iout.


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Old 12th January 2011, 12:42 AM   #33
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You could add MSB adjust as described in the datasheet.
This is my mess with 32 x PCM56:
Click the image to open in full size.
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Old 12th January 2011, 06:07 AM   #34
hotiron is offline hotiron  Scotland
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Default Sleep

Yep I've been up all night listening to this DAC couldn't stop listening I am talking X factor here and I havn't even started tweaking yet. had to pull away get some sleep
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Old 12th January 2011, 06:16 AM   #35
hotiron is offline hotiron  Scotland
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Default 2 X5V

Quote:
Originally Posted by Bernhard View Post
Longer wires can cause trouble but if you have no problems, all ok

Film caps for decoupling on all power supply pins would be good.

You can try this integrated analog filter: passive I/V + 24 dB lowpass from 20 khz + hf rolloff compensation.
It results in equivalent of 100 ohm passive I/V so you may need some post amplification.
Connect nothing else to Iout.


Click the image to open in full size.
Chips are all decoupled with Millitary grade 100nF glass passivated caps at pins
Only 2 X 5V rails and this little baby is kicking some major ***.
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Old 12th January 2011, 03:36 PM   #36
hotiron is offline hotiron  Scotland
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This is my mess with 32 x PCM56:

That looks pretty cool Bernhard. How does it sound?
Too much beer last night just a tad groggy today.

I will try your IV later on if I can find the right chokes in my junk bin.
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Old 15th January 2011, 03:54 AM   #37
hotiron is offline hotiron  Scotland
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Default Its a joke right

Bernhard are you seriously using like 2 amp air coil inductors for your IV?
Who wants to buy some TDA1541As?
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Old 15th January 2011, 04:49 AM   #38
regal is offline regal  United States
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I've tried big air coil inductors for dac analog filtering but they always pick up hum, never found a shielded air core. I believed they sounded better but it was tough to say for sure with the hum.
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Old 17th January 2011, 10:40 PM   #39
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Quote:
Originally Posted by hotiron View Post
This is my mess with 32 x PCM56:

That looks pretty cool Bernhard. How does it sound?
Too much beer last night just a tad groggy today.

I will try your IV later on if I can find the right chokes in my junk bin.
I'll give it a try:

The sound is so pure and sweet...
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Old 17th January 2011, 10:44 PM   #40
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Bernhard are you seriously using like 2 amp air coil inductors for your IV?
Who wants to buy some TDA1541As?
The coils have 0,7 mm wire. That gives low resistive loss.
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