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" <email@example.com> To: <firstname.lastname@example.org> 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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