, umn, I baked some freescale zigbee's at home in the kitchen oven a
while back:(. I think they all worked but one or 2. In my tiny toaster
I've done all sorts of stuff. I think the largest and hardest was
mcf5208 coldfire (along with more zigbee.)
I always use it to salvage odds and ends from old stuff too- to my
newer salvaged rotisery broiler I've made a quick wireframe 'saddle'
that hangs from the rotisery, fashioned a kind of 'cam' so the parts
drop from the boards without my having to interfere. I like taht
better. its bigger than my other toaster but needs lots of work to
turn into a real oven- whereas at least the smaller one has more
control unmodified.
I usually do everything by hand if there is even a sliver of pad
exposed- sometimes even without any exposed. mostly just small
pincount qfn, dfn, etc but always do my qfp's by hand with the cool
'manual wave solder' technique taht my old boss taught me- a true guru
, and self taught!
pcbs I do 1 or 2 sided, the quality is better than most I think but
probably take a lot longer than most as well. still making my own fake
vias tho, so that really sucks.
I've been busy working and farting around with linux lately so
haven't really been doing much design work,although i'm still always
piecing something together in my hed. i wish I could remember what- jd
--- In Homebrew_PCBs@yahoogroups.com, "electronut" <electronut@...> wrote:
>
> Stephanie, the parts I'm looking at are about BGAs with 400-500
> balls.
> You seem to know a lot more than me about the process. Any tips you
> can share are much appreciated.
>
> timbomcnuckle: what king of PCBs have you done with your reflow
> oven ? What kind of parts have you done ? Have you done BGAs, or
> 0.5mm TQFP ? Did you do two layers PCBs ?
> Please share your successes.
>
>
>
> --- In Homebrew_PCBs@yahoogroups.com, "Stephanie Ann Thompson"
> <setlahs@> wrote:
> >
> > I don't believe a simple hot air gun setup will work for a BGA
> part
> > with 500 pads. You need to preheat the board, and use a bottom
> heater
> > to ramp up the heat as well as a top heater. And with more
> products
> > going Lead Free, it will take a lot more heat and a lot more
> complex
> > heating profile to properly reflow the parts.
> > I had worked on a BGA machine before, the big expensive automatic
> > type... Even then it would take a LONG time to properly create a
> > reflow profile to get maybe 95% success rate. (of course we were
> > working with like 1000+ pads) I can give you some tips and
> pointers,
> > but for only doing 1-2 a year, it can get pretty expensive
> > (especially with FPGA's) and frustrating when you fail at
> reflowing
> > the part.
> > --- In Homebrew_PCBs@yahoogroups.com, "timbomcnuckle" <jaydag71@>
> > wrote:
> > >
> > > hey!, I haven't used a hot-air station yet but I have done the
> > > over-reflow a bunch fo times and I would take the time
> investment
> > into
> > > making your own rather than the alternative- especially if you
> are
> > > only oding a few boards per year! Elektor did a great version of
> the
> > > taoster oven re-flow controlled with an AVR I think, lcd display,
> > > programmable curves, precision control (within reason),, I think
> the
> > > only complaint was lack of insulation, but you can always stuff
> with
> > > rockwool or something.
> > >
> > > I have used old style black&decker toaster-oven without any
> > > modification a few times but I got a better one now that I still
> > need
> > > to finish. gluk.
> > >
>