__ Mount the Deployment Transistors
Locate the two large pads and two sets of three small pads for the deployment transistors, they
are located just below the voltage regulator but are turned 90 degrees. Remove ONE of the
transistors from its package. You are going to be mounting the TOP transistor first, since it’s
easier to do that one than to go back and do it after you’ve mounted the bottom one.
Heat up your iron, and flow a small amount of solder onto the large pad. With tweezers,
position the transistor, making sure that it is centered on the pads. Holding the soldering iron
in your other hand, heat up the large lead on the transistor until the solder on the pad begins to
flow. Hold the iron for another 5 seconds to allow the solder to wick onto the pad, then
remove the heat. Hold the transistor in place for another 10 seconds to allow the solder to cool.
One by one, solder the three small three small leads to the pads, using enough solder to cover
the pads, but making sure that there is enough solder to completely bond the leads of the
voltage regulator. Wait at least 15 seconds between each pad to prevent the chip from
overheating.
When you are done, inspect the solder joints to make sure that they are nice and shiny and that
there are no solder bridges. Note: A solder bridge in an deployment transistor can cause a
short that may destroy your Eggtimer TRS, and possibly your LiPo battery too. It may also
possibly cause an unexpected deployment when you connect the battery. Be very careful here!
Similarly, mount the BOTTOM deployment transistor.
__ Locate the spot for the 22K ohm resistor, it’s near the bottom of the board just below
the deployment transistors (marked “223”). Solder the 22K ohm resistor (marked “223” in
place). Inspect the solder joints with a 10x jeweler’s loupe to make sure you don’t have any
solder briges.
Section 3 – The Interface Side
This section deals with the components to the left of the GPS module. Note that there are some
resistors very close to the GPS module, you need to be careful to make sure you don’t touch
the solder joint that you so carefully made earlier on. A little paper masking tape over the GPS
solder joints is cheap insurance. Also, there are some “vias” close to the components as well,
be careful not to create solder bridges between the resistors and the vias. If you do manage to
bridge one, use some solder wick to clear the bridge; if the component comes off the board
when you’re desoldering, just solder it back on.
__ Locate the spot for the 330 ohm resistor, it’s near the top of the board just to the left of
the GPS module. Solder the 330 ohm resistor (marked “331” in place). Inspect the solder
joints with a 10x jeweler’s loupe to make sure you don’t have any solder briges.
__ Locate the 2.2K resistor just to the left of the GPS module and just below the 330 ohm
resistor that you just mounted (it will be marked “222”). Remove ONE 2.2K resistor (marked
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