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Old 22nd January 2013, 02:17 PM   #531
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OK - Good luck.

BTW - Could you be soldering a bit to hot? I try to do most work at 330C. Just a thought...

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Old 22nd January 2013, 02:30 PM   #532
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hm... 25 w soldering iron. not sure about the temperature
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Old 22nd January 2013, 02:33 PM   #533
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by voxxonline View Post
Dear experts
Which bit to buy for a Subbu dac soldering works?
I am using xs25 iron from antex.
Would you please advice :
List of bits

Ivan
You should get the 5060 or 5160, the sharp tip would not give you enough metal to reach the melting point fast enough.
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Old 22nd January 2013, 02:42 PM   #534
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Here is a picture of part of pcb.
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File Type: jpg IMGP7110.JPG (42.2 KB, 282 views)
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Old 22nd January 2013, 02:53 PM   #535
bcmbob is offline bcmbob  United States
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That's hard to see exactly what's happening there, but the darkness/dullness of the other solder points suggests you may not be using the best solder. Are you using liquid or paste flux in your work? Is there still copper under the grey on those open pads?
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Old 22nd January 2013, 03:00 PM   #536
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I must admit I stopped all soldering works because of this BAD solder. I ll get suggested rosin 37/63 solder and continue.
I do flux.
There is a thick copper pad in place , sort of copper bridge from wiper to the right pad.
I should listen to advise and buy good solder right away
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Old 22nd January 2013, 03:11 PM   #537
bcmbob is offline bcmbob  United States
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You can use rubbing alcohol or fingernail polish remover with an old toothbrush to clean things up before your next attempt. The investment in a good liquid flux used in addition to the flux that may be in the solder is well worth the cost. It cleans up easily as suggested above.

Mine aren't perfect but the end result should be closer to shiny bright.

I like this shape for scraping pads when necessary.

Radio Shack has a 62/36/2 silver solder that is decent and doesn't cost much.

Good Luck !
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Old 22nd January 2013, 03:16 PM   #538
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I am using this flux: LACO
What would be the best size of solder for smd ?
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Old 22nd January 2013, 03:23 PM   #539
bcmbob is offline bcmbob  United States
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ChipQuick in the syringe is my favorite. Other brands are available but the syringe is very useful. My second choice is liquid with a brush.

Whatever you use don't be afraid to use more rather than less. It all cleans up well. My work looks horrible till I do the final clean up with alcohol/toothbrush.

BTW, Dow Bathroom Cleaner (Scrubbing Bubbles) works great to remove any flux residue after the alcohol pass.
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Old 22nd January 2013, 03:42 PM   #540
syklab is offline syklab  Hong Kong
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Kester-951 is also good and no cleaning needed.
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