From: Scott McDonnell (simstoolbox_at_attbi.com)
Date: 2002-10-16 10:35:30
Oops, I totally missed that you were asking about a prototyping board (I
assume you mean an ectched PCB which fans out the leads DIP-style.) Hmm...I
don't think I have ever come across one for BGA, but I have seen alot of
them around for other SMT technologies. Probably the best advice I can give
is work with either photo-etching or to produce a dry-transfer with a laser
printer. Check out this link: http://www.fullnet.com/u/tomg/gooteepc.htm
Scott
----- Original Message -----
From: "David Wood" <jbevren@starbase.globalpc.net>
To: <cbm-hackers@cling.gu.se>
Sent: Wednesday, October 16, 2002 3:52 AM
Subject: Re: SMT mounting question
>
>
>
> I'll quote from two previous messages to save some reply traffic :)
>
>
> Marko, Agreed. My oven can go well beyond the soldering profile specified
> on the datasheet for the IC. I'm at work, so I'm taking a guess here.
The
> profile had a peak temperature of around 218c, which any household oven
can
> reach. However, I'm concerned about maintaining control over the
> temperature. For example, the peak temperature should only be maintained
> for about 60 seconds, after which the board is to be slowly cooled.
>
> Pasi, Good idea. I did get two ICs as can be seen in the diagram, so I
> guess I have one to 'burn' (my normal methodology, but I had no intent on
> tempting the literal meaning's fate). :) Any hair dryer that can bake a
> chip on will most certainly turn some poor girl's mop into a twisted
smelly
> mess. ;) I will have to go and get a genuine heat gun.
>
> However, I'm more concerned about the lack of control with a heat gun than
I
> am with an oven. I can open the door a crack after I see the chip settle,
> and wait for the oven to cool that way. :)
>
> Next step: getting the traces out of that point array. :) I guess I'll
have
> to have a test board or two made.. that's gonna hit my pocket hard I'm
sure.
> :) Does anyone know of prototyping PCBs with bga mount pads?
>
> If things turn out to be reasonable enough for this IC, I'll probably end
up
> using it for UHS's primary controller. It would save me a lot of *pld
> hardware design time, and will offload filesystem and device handling from
> the c64's CPU. I'll explain my methodology in another post, as it's not
> related to the acutal soldering of the IC.
>
> -David
>
>
> Marko ->>
>
> Please reply to the list; many BGA chips could be used in interesting
> Commodore hardware projects.
>
> I don't have any personal experience on soldering BGA, but have you
> considered mounting the chip on the board with some heat-resistant tape
> or glue, and then putting it in an oven? If I were to build something
> with BGA chips, I'd design the board so that there are BGA chips only
> on one side, and I'd solder these parts first. The rest can be done
> with a soldering iron.
>
> Marko
>
>
> On Wed, 16 Oct 2002, Ojala Pasi 'Albert' wrote:
>
> > > I don't have any personal experience on soldering BGA, but have you
> > > considered mounting the chip on the board with some heat-resistant
tape
> > > or glue, and then putting it in an oven?
> >
> > You can "solder" BGA chips quite easily with a hot-air blower:
> > put the chip into the approximate position, then heat it with
> > the blower. When the solder melts, the chip will align itself
> > automatically. Then very carefully remove the blower, i.e.
> > increase the blowing distance so that the chip remains aligned.
> >
> > A normal hot-air blower for hair probably doesn't have enough
> > power for this though..
> >
> > -Pasi
> > --
> > "As well try to understand the sun, Perrin. It simply is,
> > and it is not to be understood. You cannot live without it,
> > but it exacts a price. So with women."
> > -- Gaul in The Wheel of Time:"The Shadow Rising"
> >
> > Message was sent through the cbm-hackers mailing list
> >
>
>
> Message was sent through the cbm-hackers mailing list
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