The four display boards are all wired up in much the same way, although there are a few minor differences. We suggest that you assemble the "Scoreboard Display 1" (Period) board first, as this has the fewest parts. Fig.10 shows the details.

Take care with the LED orientation.

Fig.10 (left): the assembly details for the Scoreboard 1 (Period) display.

This display uses the BSB-D1 board and there is only one wire link to fit – just to the right of the 26-way DIP header. After fitting the link, add the 26-way DIL header, with its centre-locating slot on the left.

Next, fit the three resistors and the 1000μF electrolytic capacitor. You can then fit transistor Q1 (PN100) and the BD136/140 power transistor (Q2). The latter has its leads bent down by 90° about 6mm from its body, so it mounts flat against the board. Secure it to the board using an M3 x 6mm screw and nut before soldering its leads.

This board can now be completed by fitting the 28 high-brightness 10mm yellow LEDs which form the display segments. These all mount with their longer anode lead towards the top of the board.

In practice, it’s just a matter of pushing each LED right down onto the PC board and then soldering its leads. Do this 28 times and the Period display board is finished.

The two "Scoreboard Display 3" (team score) boards are assembled in a similar manner. However, these both have three sets of digit driver components and 67 LEDs each, instead of only 28.