group buy for homebrew CPUs?

Don THX1138 at dakotacom.net
Fri Aug 11 23:25:42 CDT 2006


Patrick Finnegan wrote:
> On Friday 11 August 2006 23:32, der Mouse wrote:
>> Admittedly, that could be a lack of tools.  Given a stereo loupe,
>> pantographic waldos, and a really fine-point soldering iron, it quite
>> possibly wouldn't be all that tough.  But those ain't cheap, and I
>> think needing significantly more expensive equipment counts as
>> "harder".
> 
> All you need is to use lots of flux and a chisel-tip soldering iron.  With the 
> correct technique (which is one of the few useful things I learned in my ECE 
> classes), it's fairly easy to do.
> 
> Basically, you tack down the corners of the chip, and then draw the chisel tip 
> across the pins, along with the solder.  Using plenty of flux is essential 
> for this to work, and it'll probably take a couple of tries to get the 
> technique down.

This works "adequately" with gull-wing packages.  But, Jlead,
BGA, etc. it's easier to just shoot yourself in BOTH feet
before even getting started!

> Trying to solder the pins individually, and avoiding bridging them (like if 
> you didn't use enough flux) is a complete pain in the ass, and just a bad 
> idea.
> 
> Passives are a bit trickier, but if you use a hemostat or pair of tweezers to 
> hold onto it, that shouldn't be too difficult either (hint: tin the PCB pads 
> first).

Solder paste and hot air are infinitely easier.



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