I am interested too in how you alligned the bga to the pcb. One problem
with high density components is that they were at 1 mm pitch... no 8
mill pitch flip chips... no 6 mill pitch flip chips...
Still if you did the alignement and then had a reasonable yeild (>50%)
then I take my hat off to you. My point has been that these tools are
capable of professional (whatever that meens) capabilities.
Again, Darrell... I do congradulate anyone who can build boards with
high density components in less then ideal conditions.
Taking a bow,
Steve Meier
Darrell Harmon wrote:
Dan McMahill wrote:
Darrell Harmon wrote:
Stephen Meier wrote:
Let me echo ...hello.....hello....hello...
I have had very complex board built with these tools. If the boards
anyone else is trying to build dont work it is probably do to the
manufacturing process of the boards and not due to the design
tools. Hey if you can attach a bga with a toaster more power to you
(or the oven got the bread the right collor of brown). using
companies that are good at depositing 900 pin bgas has been
successfull.
Steve Meier
I did successfully attach the BGA using a $20 toaster oven. I used
a MAX6675 thermocouple to SPI converter connected to the parallel
port of my laptop along with a relay to switch the power to the
oven. I set the oven on broil and got mostly infrared heating. I
can post the temperature profiles if anyone is interested.
I'd like to see the profile. Now when you outfit your toaster oven
with ethernet, then I'll be impressed ;) Still, thats pretty cool.
I take it that you're actually regulating temperature not just
monitoring it?
-Dan
It will probably be late Saturday night or Sunday afternoon, but I
will post the profiles, schematics and code (none of it is on this
computer). I just used simple thermostatic control (no PWM) and it
stayed within 2 degrees C of where I wanted it to be when it could
keep up. I only got about 0.5 to 1 degree per second. I may move the
lower heating element (quartz tube) up to the top to double my heating
power or even buy a second oven for more elements. Even with this
slow heating, not even the connectors were damaged.
