- 4 -
Printed Circuit Board
The TinyTrak3Plus printed circuit board (PCB) is double sided, silk-screened, and solder masked. It may be slightly
different from the one pictured below as new board are created. If TinyTrak3Plus is ordered without a case, the PCB MAY
be a bit wider and have mounting holes in the four corners.
Upgrading from an older TinyTrak
TinyTrak3 chips can run on the same circuit board as TinyTrak and TinyTrakII. Owners of these can upgrade to TinyTrak3
functionality by simply replacing the microcontroller with a TinyTrak3 chip, and using the TinyTrak3Config program.
Assembly Instructions
TinyTrak3Plus is a fairly simple construction project that can usually be built in less than an hour. You will need a low
wattage pencil-type soldering iron with a small tip, some thin solder, and a pair of diagonal cutters. The microcontroller
(U1) is static sensitive, so use standard precautions. For each item, insert on the component side (white silk-screened
side), then turn the board over and solder the leads to the pads on the trace side. Be sure to only solder the correct pad,
and do not let any solder touch any other pad or trace. Trim any excess leads with diagonal cutters after soldering each
component. The following checklist will be useful to insure all components are properly assembled. This list is ordered by
component height, which is a convienent way to build, but componets can be added in any order.
Install 5 capacitors C1 – C5. (0.1uf,
104). Direction does not matter. Bend
the leads apart slightly after insertion to
prevent them from falling out when the
PCB is upside-down for soldering.
Install voltage regulator U2 (7805).
Bend the leads so that the large
mounting hole at the top is aligned with
the hole on the PCB. There are 3
holes under the U2 leads for a smaller
regulator option, but they will not be
used. If desired, you can not cut the
U2 leads after soldering to help with
heat disapation.
