6 |
P a g e
6.
Repeat the same steps as before in order to create three more columns.
7.
Now, begin soldering four rows of LEDs on the PCB where the following reference
numbers are printed: (P03, P33), (P07, P37), (P02, P32), (P06, P36), (P01, P31), (P05,
P35),
(P00, P27, P30)
,
(P04, P27, P34)
,
(P04, P23, P34)
and
(P00, P23, P30)
. The leads
must be soldered on the other side of the board. The schematics that have three reference
numbers just like the ones highlighted above in red are where all three pins of the LEDs
can be soldered on the board. The schematics where there are only two reference numbers
are where only the two outer pins of the LEDs can be soldered on the board. The middle
pins must be soldered to the middle pin of the LED directly to the right, down the row (so,
for instance, the middle pin of (P03, P33) will get soldered to the middle of (P02, P32) and
so forth down the row – the same thing should be repeated for the three other rows). If done
properly, a structure just like the one in Figure 4 must be obtained.
Note:
Notice that the schematics with “COM" right next to their reference number are not
used for the LEDs as they will later be used to power the latter.
Note:
It is suggested not to push down the bottom row LEDs all the way into the board in
order to have longer outer leads for later steps.
8.
Begin by installing each of the four previously made column of LEDs on top of the bottom
rows of LEDs as it can be seen above in Figure 4.
Figure 4: The correct soldering process of the bottom row LEDs
