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
Regards,
Ray
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
Ray
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
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
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
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
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
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
I've found that as long as the lead spacing on ICs is 0.5mm or larger, I can solder by hand with a fine tip on a Metcal or similar soldering system and using very fine solder. If you bridge a couple pins you can fix with solder wick. The best thing to do is to solder diagonally opposite corner pins and once the device is located properly (and legs not floating off the board in solder) to solder down the othe two diagonals. Then solder the rest of the pins.
I find using strong magnification essential; more is needed now than 15 years ago, but even then fine pitch stuff is next to impossible to do with the naked eye.
I find using strong magnification essential; more is needed now than 15 years ago, but even then fine pitch stuff is next to impossible to do with the naked eye.
Update on mt EZDAC 1.5
Hi all,
I did take Ray up on his kind and generous offer to take a look at my board and he was able to get it singing in no time. He discovered that I had screwed up one of the pads on a cap feeding the reciever and had a loose pad on the reciever. Thank you Ray, I could have never found those faults myself.
So now there is one more EZDAC in the world. My build is the bog standard, single PSU. But so far my impressions have been very favorable. It easily sounds significantly better than the modified DVD player it is replacing. Much more relaxed with very good imaging and detail. I'll let it burn in for a few days and try to do a head comparison against the opus DAC from twisted pear audio that I built last year. They have very similar features. Next moves will be to add a separate PSU to separate the digital and analog sections, and add CRDL and CRDR. I'll report back with my impressions of these changes.
PJN
Hi all,
I did take Ray up on his kind and generous offer to take a look at my board and he was able to get it singing in no time. He discovered that I had screwed up one of the pads on a cap feeding the reciever and had a loose pad on the reciever. Thank you Ray, I could have never found those faults myself.
So now there is one more EZDAC in the world. My build is the bog standard, single PSU. But so far my impressions have been very favorable. It easily sounds significantly better than the modified DVD player it is replacing. Much more relaxed with very good imaging and detail. I'll let it burn in for a few days and try to do a head comparison against the opus DAC from twisted pear audio that I built last year. They have very similar features. Next moves will be to add a separate PSU to separate the digital and analog sections, and add CRDL and CRDR. I'll report back with my impressions of these changes.
PJN
Hi Ray,
It made it back over the pond in one peice, it was delivered this past Friday. I think it may well be the most extensively traveled EZDAC out there.
Evan,
I have the diodes in my parts bin so I think I'll pop them in first, before the additional PSU. First I want to get a good handle on the unmodified DAC's performance so that I can tell if there is a difference.
PJN
It made it back over the pond in one peice, it was delivered this past Friday. I think it may well be the most extensively traveled EZDAC out there.
Evan,
I have the diodes in my parts bin so I think I'll pop them in first, before the additional PSU. First I want to get a good handle on the unmodified DAC's performance so that I can tell if there is a difference.
PJN
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.