Specifications

Eggtimer Remote Switch Assembly Checklist
Before you solder anything, make absolutely sure that you have the correct part and that it is
inserted in the board correctly. The board has all of the component values, outlines, and
polarities silk-screened on the top, so there shouldn’t be any doubt about what goes where and
how. Nevertheless, if you have any questions about the assembly procedure, do not hesitate to
drop us a line at [e-mail] before you solder the parts to the board. You
may have to wait a day for the answer, but it could save you a lot of grief later on!
The Remote Switch Limited Warranty does not cover damage to parts while attempting to
desolder them because you inserted something incorrectly. We spent a lot of time making
sure that the assembly instructions were clear, but once again if you have any questions about
the assembly procedures drop us a line at [e-mail] before you solder.
OK, so let’s get started…
__ Mount the ATTINY84A-SU Processor
Carefully remove the processor chip from the baggie in which it was shipped. Identify the
notch or “bar” at one end of the chip, this end needs to line up with the notch that’s
silkscreened on the PC board.
Tape the PC board down to your work surface with some masking tape. Lightly “tin” ONLY
the bottom-right pad of the 14 processor pads. Hold the processor in place with some
tweezers, set it down on the PC board, and heat up the lead over the tinned pad until the solder
melts onto the lead.
With a 10x jeweler’s loupe, inspect the alignment of the leads over the pads to make sure that
they are centered. If they are not, carefully heat up the solder joint and move the processor as
necessary to get them centered. Once you are satisfied that the leads are all lined up with the
pads, solder the remaining pads one by one, using as little solder as possible, and alternating
sides and pins to prevent overheating the processor. Wait 15 seconds between solder joints to
allow the processor to cool down.
When you are done, inspect the solder joints again, making sure that there are no solder bridges
or incomplete joints.
__ Mount the .1uF capacitor
Locate the spot for the .1 uF capacitor, just below the notch on the processor. The .1 uF
capacitor is the small brown part with no markings. Note that there are other capacitors in the
kit, but the .1 uF is a bit smaller. Lightly tin only ONE of the two pads on the board. With
tweezers, lay the capacitor down on the board, and heat up the lead over the tinned pad until
the solder flows. Wait a few more seconds, then remove the heat, holding the capacitor there
until the solder cools for about 5 seconds. Let it cool for another 15 seconds, then carefully