RE: SMD soldering?

From: Scott <rylos_at_charter.net>
Date: Sun, 1 Nov 2009 08:32:44 -0500
Message-ID: <007c01ca5af7$cb8eb630$62ac2290$@net>
Justin, 

>There are even some rather heroically brave demonstrations  
of doing it with a complete crap 5W iron that I would not attempt  
myself, where the guy wipes hot solder across all the pins on one side  
of a 48 pin package at once with a big blob then magically soaks it up  
with braid leaving a beautifully mounted device.

Good point! 

This is pretty standard technique in the industry minus the solder braid.
The External Flux will keep the leads from bridging as long as you prep
properly and make sure you don’t have too much solder on your iron. 

-----Original Message-----
From: owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Justin
Sent: Sunday, November 01, 2009 08:08
To: cbm-hackers@musoftware.de
Subject: Re: SMD soldering?

Andre, there are also a lot of video guides to doing SMD soldering on  
YouTube that show various tricks for doing it with home-grade  
equipment.  There are even some rather heroically brave demonstrations  
of doing it with a complete crap 5W iron that I would not attempt  
myself, where the guy wipes hot solder across all the pins on one side  
of a 48 pin package at once with a big blob then magically soaks it up  
with braid leaving a beautifully mounted device.

...but there are some actually good guides that are worth watching.

Another thing that can help a lot is a stereo microscope on an arm.   
You can sometimes find these on eBay fairly cheap.  I used an  
illuminated magnifying loop to solder wires onto the flash roms on my  
PS3 motherboard a couple years ago and it was headache inducing  
compared to using the microscope, so I recommend steering away from  
the graphic designer magnifying lamps.

Justin

On Nov 1, 2009, at 7:49 AM, André Fachat wrote:

> Hi Scott,
>
> I'm soldering SMDs onto newly made PCBs (my own design, for some new  
> boards of my selfbuilt 6502...) The PCBs got solder resist (solder  
> mask, Lötstopplack) on them, I didn't trust myself enough to not use  
> it...
>
> I did solder the other ICs with 1.27mm pin distance (74xxx logic,  
> RAM) with a small soldering iron and small solder and it worked fine.
> Even with traces running between the pins. I did use a magnifying  
> glass though... :-) (and some desoldering braid(?) to get  
> superfluous solder away).
>
> Only the other ICs I have are even smaller. I'm new to soldering  
> with flux, but it seems I'll have to give it a try.
>
> Thanks for your advice!
> André

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