ezDAC v.1.5 Builders Thread - Page 27 - diyAudio
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Old 25th March 2010, 10:22 PM   #261
PJN is offline PJN  United States
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Hi Ray,

You were right, I had a bad joint on F2, I fixed it and I am getting 3.3v on pin 4 Vdd and 0.73v on pin 3. But unfortunately still not singing.

I checked voltages around U6 and the pulse transformer they are shown in the pics attached.

PJN
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File Type: jpg U6.jpg (110.0 KB, 186 views)
File Type: jpg Transformer.jpg (82.0 KB, 182 views)
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Old 25th March 2010, 10:34 PM   #262
6h5c is offline 6h5c  Netherlands
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Looks o.k. to me. How did you attach the S/P-dif signal, did you connect ground of the coax to J0 and signal to J1?

Ray
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Old 26th March 2010, 02:40 PM   #263
PJN is offline PJN  United States
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Hi Ray,

Yes I did and I verified that the digital source was working correctly by trying it on my other system. Here are some pics of my hookups. I also checked the rca's back to the board for continuity they were all fine.

PJN
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File Type: jpg Board hookups.jpg (160.1 KB, 183 views)
File Type: jpg Spdif in.jpg (159.7 KB, 179 views)
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Old 26th March 2010, 03:11 PM   #264
6h5c is offline 6h5c  Netherlands
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Well, I think for further investigation you need a scope, to verify the digital signals between the three chips. It could be something tiny like a resistor or cap in the 8416 PLL circuit, or around the other chips that's causing the problem. A good DMM with frequency measurement capabilities would also work. Then you can verify the bitclock and wordclock signals.

Regards,

Ray
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Old 27th March 2010, 10:53 PM   #265
PJN is offline PJN  United States
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Hi Ray,

Thanks for the help. Since I don't have a scope or want to buy one I guess I'll spend some time double checking all of the smds. If I can't get it working I'll consider this project as experience gained and use whatever parts I can for future projects.

PJN
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Old 27th March 2010, 11:06 PM   #266
6h5c is offline 6h5c  Netherlands
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Ok, I hope you can find something. Maybe there's a fellow-DIY'er in your neighbourhood that can check it with a scope for you? As an alternative, you could send the ezDAC board to me and i'll check it for you. It will cost you some shipping, that's all. I'd hate to see your ezDAC project strand like this...

Ray
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Old 29th March 2010, 09:05 PM   #267
PJN is offline PJN  United States
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Ray,

Thanks so much for your kind offer. A little shipping would be a small price to pay considering all the time I've invested in this project so far. I'll give it one more going over this week to see if I've missed anything obvious. If I can't get it going I'll email you privately for mailing directions.

PJN
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Old 29th March 2010, 09:46 PM   #268
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PJN, sorry for saying that, but your soldering looks very messi.

I think you should accept Ray's offer. This was my idea too, to help you
bring this project to a sucsessful end.

All SMD have to be tied up. May be something is toasted or shorted.

Without a scope I guess you have no chance to bring it up to live.

Let me know if I can do something.

regards Michael
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Old 29th March 2010, 10:59 PM   #269
PJN is offline PJN  United States
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Mikel_ann,

I agree with you, my soldering is messy, this was my first experience with using SMD parts. My eyes aren't what they used to be and I found working with such tiny parts challenging. I will be taking up Ray on his kind offer after I give it one last try.

PJN
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Old 30th March 2010, 08:51 AM   #270
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Hi PJN, try to find a 35mm wideangele lense upside down or a
a lense from a slide projector to check and solder.

I put some on my table lamp for doing this job.

Try that, it works fine.

For soldeing you need a sharp soldering tip and only a very little bit tin.
You can use Collophium (from pharmacy) dissolved in alcohol as flux or
"solder honey". Check Youtube for soldering SMD.
With a small brush you can brush the flux on the board an on the legs.

Take some old Computer boards and try to remove parts an back again.
For removing an "heatgun" is useful. (like a hairdryer, but hot if this translation is wrong)

Its not an easy job, but possible.

regards michael
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