I wanted to mess around with the capable and extremely inexpensive Freescale accelerometers in LGA-14 packages, so I created the artwork I could use to etch LGA-14 to DIP-14 adapters via the toner transfer method. For the toner transfer, I print on glossy magazine covers and transfer the toner using a hot laminator. After etching, the adapter array was tinned using expired solder paste in an old skillet with the excess solder being removed from traces using solder wick. For the SMT soldering, I used expired Kester Easy Profile 256 paste and the skillet method. The paste was applied through a stencil made from a small piece of transparent report cover with slots cut for the two side pad arrays. This was made by positioning the clear cover plastic over a page containing the printed artwork and using a razor blade to cut the slots in the appropriate positions. A credit card was used to wipe the paste across the stencil and a toothpick used under a magnifier to apply a tiny dab of paste to each of the end pads. The device was then picked and placed using tweezers. Even though there was no solder mask on the board, there wasn't the slightest hint of bridged joints when inspected from the bottom through the translucent circuit board and the MMA7361 functions perfectly.
600dpi artwork for a 3" x 4" board:
Photo of etched board:
Completed adapter with attached .1" centers male headers:
The white specs on the final board are tiny amounts of flux I missed when I used 91% isopropyl alcohol to clean the board after SMT soldering. Significant magnification reveals all.