High Performance WM8741 Upsampling DAC New Version build thread (show 'n tell too)

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#101
for a general case nothing regal. I miss-stated it.

As long as the load impedance reflected to the driver is correct there should be no problem if the transformer is not a dual primary (CT) version like I'm using with the ct grounded.

Using the transformer I have wouldn't matter either if you left the ct floating.

I was think specifically about the Edcor WSM10K/600 that I must have been discussing in another thread.
 
#103
OK, I had to test it since the minidac board is ready. I read through the configuration text and gave it a try in HW mode. With only USB connected the led2 gave light. I added power and all 3 shone. My PC found it as an USB Audio device. I chose 192khz and OSR pins accordingly and kept the FSEL pins open...

Silence... The only sound I get is a 2sec "Peeeeeeew" when I switch it off with the combined switch/potentiometer. I have tried the mute pins in every possible configuration without luck.

The rest of the pins are all open.

So this is my story - any successes out there?

Brgds
 
#108
tcpoint said:
Post some pictures.
Click to expand...

Yeah, right... How do I do that? Does insert image work or do I need to sign up at some other place and link afterwards? If the later forget it...

I'll give it a test though but it will take some time. Best luck ;-)

Brgds

Jepp, as I thought - insert url of my image... I don't want to do this....
 
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#111
OK, here they come.

Hopefully they show up...

I can't se them. Well, actually I could 🙂 after submitting...

But anyway I can't figure out what you could find wrong in these pictures... They arn't of a quality where one could pinpoint anything from.

Now this was quite cool... I could take some closeups of your chosing with some lenses I have...

Brgds
 

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#115
I have also populated two boards from the first round, none of them functioned. After inspection, both had shorts on various points so it is not clear what is the status of the ICs. Did anyone manage to have a working board?
 
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#116
I'm getting ready to place my parts order and was wondering if a 10K load is necessary in place of the volume pot if the buffer is used, but not the headphone amp?

Replace the 47K (R28,R29) with 8.2K resistors?

What IC is used for the headphone amp?
 
#118
nope and when they promote it by saying things like this

selected materials to create superior acoustic sound
Click to expand...
without further detail; it kinda turns me off.

nichicon make some really great caps and at a reasonable price too, but the audio grade stuff seems to me to actually be lower quality for more money
 
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