5-4 Relay Control
Connections
An external relay circuit is connected to the power supply via the miniature phono jack on the rear
panel (labeled relay control 15VDC MAX). The required phono plug that mates to the phono jack is
shown in Figure 5-2. The illustration provides terminal identification for the conductors of the plug.
This phone plug is available from Switchcraft, Inc. (see table for Switchcraft connection accessories).
Also available from Switchcraft is a three-conductor patch cord that is terminated with a phono
plug on each end. The patch cord is available in various lengths from 0.5 ft to 6 ft. The part numbers
for the patch cords are listed in the table for Switchcraft connection accessories. You can remove (cut)
one of the phono plugs from the patch cord. One end of the modified patch cord plugs into the phono
jack on the power supply, and the unterminated end is hard-wired to the external relay circuit(s).
Another alternative is to wire the external relay circuit to a second phono jack. You can then
use an unmodified patch cord to connect the relay circuit to the power supply. The part number
for the phono jack is listed in the table for Switchcraft connection accessories.
Switchcraft, Inc.
5555 N. Elston Ave.
Chicago, IL 60630
Phone: 312-631-1234
FAX: 312-792-2129
Table 5-1
Switchcraft connection accessories
Part number Description
TT253
UJ2B
TT741
TT742
TT744
TT746
TT747
TT748
TT749
Miniature Phono Plug (3-conductor)
Miniature Phono Jack (3-conductor)
Patch Cords (3-conductor):
0.5 ft patch cord
1 ft patch cord
2 ft patch cord
3 ft patch cord
4 ft patch cord
5 ft patch cord
6 ft patch cord
Relay
+5VDC
Chassis Ground
Figure 5-2
Miniature phono plug
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