Relay Select for 8 Source

Relay select for 8 source.Select each relay by supply 24 DC Voltage to pin 1 -8 of SL2.
Path List :
R1-8=4.7 Kohms T1-8= BD139 (R1-8=15 Kohms if T1-8=BD679)
RL1-8=6V-24V dc Relay D1-8=1N4148