Pin Assignment
1 Base 1
2 Base 2
3 Base 3
4 Base 4
5 Base 5
6 Base 6
7 Base 7
8 Base 8
9 Ground
10 Common cathode (for flyback diodes)
11 Collector 8
12 Collector 7
13 Collector 6
14 Collector 5
15 Collector 4
16 Collector 3
17 Collector 2
18 Collector 1