From: David Wood (jbevren_at_starbase.globalpc.net)
Date: 2002-10-16 11:03:50
I dont expect a 120-pin DIP adaptor to exist. :) A set of headers, or a
square board with pins would do. You have the idea however.
I dont want to use prototype sockets in the long run, so knowing how to
mount these reliably at home would be great for final products.
-David
On Wed, 16 Oct 2002, Scott McDonnell wrote:
> 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
>
>
> Message was sent through the cbm-hackers mailing list
>
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