"Reference" TDA1541A DAC with I2S-BUS architecture - Page 46 - diyAudio
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View Poll Results: Surface Finish for future PCBs
ENIG - Electroless Nickle/Immersion Gold 55 45.45%
Immersion Silver 36 29.75%
Immersion Tin 18 14.88%
OSP - Organic Solderability Preservatives 12 9.92%
Voters: 121. You may not vote on this poll

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Old 4th January 2011, 09:17 AM   #451
noizas is offline noizas  Lithuania
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Hi Oliver,

happy new year to you too

thanks for fast answer.

I agree to your advice that those diy devices are not going to play anywhere in outer space .
But, if NASA devices suffer many G overloads for short period, then audio equipment suffers micro-G overloads for many years

So this is not "snake-oil" issue: we need to take into account that "cold joint" is quite "popular" in audio devices, especially in older than 10 -15 years.

Maybe I hope to use assembled devices tiil end of my days .
This is why eutectic solder is better.

Simply, please take into account for future orders on PCB - gold is not always welcome, better cover solderable contacts with Rosin alloy.

Saulius
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Old 4th January 2011, 10:49 AM   #452
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Exclamation Poll added

On "noizas" remark to different PCB Surface Finishes
and their solder abilities, i add a poll at the start of the thread.

Please feel free to add your wishes.

Thanks,
Oliver
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Old 4th January 2011, 12:39 PM   #453
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Quote:
Originally Posted by dvb-projekt View Post

. . . poll at the start of the thread.
What are the differences between the finishes?

(It's perhaps a bit like voting in an election - no-one knows what the differences are but it doesn't really matter because what you vote for will never be what you get )
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Old 4th January 2011, 01:47 PM   #454
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Quote:
Originally Posted by Ryelands View Post
What are the differences between the finishes?
There is a nice illustration on the webside from multipcb between the Surface Finishes.
The only one that they dont produce is the OSP surface finish.
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Old 4th January 2011, 01:53 PM   #455
noizas is offline noizas  Lithuania
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Hi Ryelands

difference between finishes is simple - solder should have same metal in alloy formula, because "foreign" metal dissloves in solder joint in case of overheating, producing intermetallic compounds, which make joint unstable for current, wet and vibration.
You can check wikipedia for more detailed info.
By the way, gold is one of worst contaminants of solder joint

Most of audio diyers use common solders, based on tin with alloying parts of silver and copper.
If you gonna use eutectic solder, only few of them have gold included and almost all of them are VERY expensive as part of gold is above 80 percent .

This is why I asked for Oliver's advice about soldering gold plated PCB.

IMO, finishes in priority should be: tin, silver, OSP. No way gold.

But if you already have gold plated PCB or component leads (like me now ) , here is a good way too - use solder with a lot of tin - it helps a bit.

Saulius
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Old 4th January 2011, 08:12 PM   #456
noizas is offline noizas  Lithuania
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Hi Oliver

thank you for link to very fine website .
Now it is more clear the reason for different finishes.

Can you find out how thick gold layer is on your PCBs?

Maybe it has miserable effect on solder joint?
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Old 5th January 2011, 08:08 AM   #457
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Quote:
Originally Posted by noizas View Post
Can you find out how thick gold layer is on your PCBs?
Hi Saulius,

the Immersion Gold thickness of my pcbs is 1-3 microinch.
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Old 7th January 2011, 04:43 PM   #458
Malka07 is offline Malka07  England
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My Ultra High Speed Buffer board arrived today Thanks Oliver

The TDA1541A REF DAC has been playing for the past 3 hours

I will post my thoughts once it has burned in.

Alon
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Old 10th January 2011, 12:16 AM   #459
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Oliver:

Thank you for the Ultra High Speed Buffer board. Mine has arrived today. What are P/N for fixed terminal connections?
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Old 10th January 2011, 04:26 AM   #460
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Quote:
Originally Posted by dsolodov View Post
Oliver:

Thank you for the Ultra High Speed Buffer board. Mine has arrived today. What are P/N for fixed terminal connections?
You could use normal 2.54mm terminals or the
Wago 236-402 type.
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