[Coco] Surface Mount Soldering

[Little John (GIMEchip.com)]

I was initially going to use a BGA SRAM in the DE-1 Expansion Board, but 
when I researched it I found most people probably wouldn't be able to 
assemble the boards (including myself by the way) so I switched to a TSSOP, 
which with a giant magnifier, I might be able to solder. :-)
-J
----- Original Message ----- 
From: "Mark Marlette" <mmarlette at frontiernet.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Tuesday, July 06, 2010 11:33 AM
Subject: Re: [Coco] Surface Mount Soldering



>

> Trust me, 5 mil bumps are not easy to deal with.

>

> As I recall, the DE1's FPGA has 584 pins on it, BGA form, about 1" sq.

>

> As it is easy to put down a BGA, it is harder to do it correctly and be 

> able to verify your workmanship which, IMHO requires xray.

>

> Not to many hobbyist are going to drop $100k for Xray... :)

>

> I avoid BGA packaging as much as I can.

>

> Mark

> Cloud-9

>

> ----- Original Message -----

> From: Little John (GIMEchip.com) <sales at gimechip.com>

> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>

> Sent: Tue, 06 Jul 2010 16:06:59 -0000 (UTC)

> Subject: Re: [Coco] Surface Mount Soldering

>

> Uh Oh - I've started a debate :-)

> J/K - I've often wondered how a hobbyist could work with BGA and then I

> decided this morning to look at youtube. Man there are all kinds of videos

> on there - some of the techniques by hobbyists such as myself don't look

> like they could possibly work, and yet they do. I am amazed at the 

> ingenuity

> of some of these folks.

> -John

> ----- Original Message ----- 

> From: "Mark Marlette" <mmarlette at frontiernet.net>

> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>

> Sent: Tuesday, July 06, 2010 10:51 AM

> Subject: Re: [Coco] Surface Mount Soldering

>

>

>> james,

>>

>> How does one manually locate/align(x/y/z/theta,down force) of a BGA on to

>> the pads using a hotplate?

>>

>> I use our Air-Vac DRS25 unit and I am spoiled with it.

>>

>> Mark

>> Cloud-9

>>

>>

>> ----- Original Message -----

>> From: jdaggett at gate.net

>> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>

>> Sent: Tue, 06 Jul 2010 13:57:08 -0000 (UTC)

>> Subject: Re: [Coco] Surface Mount Soldering

>>

>> The key to using a soldering iron for SMT work is having enough flux on

>> the board and not to

>> much solder.

>>

>> There are other alternatives to the soldering iron approach.

>>

>> One is a hot plate. A 4in square hotplate by Thermalake is very good

>> alternative.

>>

>> Second is the few toaster oven reflow boards out there. The stand alone

>> controllers range in

>> the $60 to $100 and then add what ever your local Walmart or Taget has in

>> a 1500 watt

>> toaster oven.

>>

>> The lone issue with the toaster oven is that it should have burners on 

>> the

>> top and bottom and

>> a circulating fan inside to reduce hot zones. ALso the toaster oven 

>> method

>> needs to work at

>> max temperature to melt the newer lead free solders. Also the different

>> preheat times will

>> need adjusting.

>>

>> I still like the hotplate for small boards. especially with BGA packages.

>>

>> james

>>

>> On 6 Jul 2010 at 0:30, Aaron Wolfe wrote:

>>

>>> On Mon, Jul 5, 2010 at 9:39 PM, Little John (GIMEchip.com)

>>> <sales at gimechip.com> wrote:

>>> > This guy has some amazing videos on SMT soldering - I never get bored

>>> > just watching these. Some have sound, some are silent, but they are

>>> > beatiful nonetheless :-)

>>> > http://www.youtube.com/watch?v=wQXhny3R7lk

>>> > This is the vertical drag technique that my dad uses too.

>>> > -John

>>> > P.S. check out all of this guys videos if you have time. They are

>>> > amazing.

>>> > -Lil' J

>>> >

>>>

>>> That is interesting to watch.  I recently got a ham license and have

>>> been soldering together some very simple circuits to reduce

>>> interference when connecting a radio to an PC to decode digital

>>> modes.. anyway, boy am I bad at soldering!  That guy is like the

>>> maestro of solder.

>>>

>>> There are a lot of good "how to" videos on youtube for all kinds of

>>> things, if you're in to do-it-yourself, its a great resource.

>>>

>>>

>>> > --

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>>> > Coco at maltedmedia.com

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>>> >

>>>

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>>

>>

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