__ Using only a tiny amount of solder, solder the other pad into place. You may want to
use a very small piece of PAPER masking tape to hold the resistor in place so that it won’t
come off the board in case you overheat it a little and heat transfers to the other pad. (Trust us,
this happens…)
__ With a 10x jeweler’s loupe, inspect the solder joints. Redress as necessary.
__ Similarly, solder the LOWER of the two 10K resistors.
__ Now, solder the OTHER two 10K resistors that are immediately to the right of the ones
that you just soldered.
__ Before you go onto the next step, take this opportunity to look at the GPS pads on the
right-hand side one more time with your 10x jeweler’s loupe, to make sure that you have good
solder joints that cover the pad AND the half-moon pads on the GPS module. Once you start
soldering components next to the GPS module, it’s going to be harder to get to it, so one more
look right here may save you a lot of time later…
__ Locate the two 10K resistors just to the right of the GPS module. Solder them into
place, being careful to avoid solder bridges and inspecting them as you go.
__ Locate the 2.2K resistor (marked “222”) located near the top of the board between the
10uF capacitor’s place and the LED’s place. Carefully mount it, being careful to avoid solder
bridges and inspecting the solder joints.
___ Mount the Voltage Regulator
Locate the large pad and the three small pads for the voltage regulator. Remove the voltage
regulator from its package. Make sure you have the voltage regulator and not one of the
transistors, which look very similar; there is only ONE voltage regulator, and the number on it
should end in a “33” or it will have a “33” followed by a few letters. Heat up the large pad
with your soldering iron and flow some solder on the large pad, just enough to cover it. Place
the voltage regulator IC in place, and hold it down, then heat up the large pad on the voltage
regulator until the solder starts to flow. Hold your soldering iron on the pad for another 5
seconds, then remove it and wait at least 15 seconds. The large pad on the voltage regulator
should be firmly bonded to the pad, if not then wait 45 seconds, heat it up again, until it is.
You may have to apply a little more solder if you reheat it.
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 the voltage regulator can cause a short
that may destroy your Eggtimer TRS, and possibly your LiPo battery too. Be very careful
here!
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