Oakley 3U User Manual - page 13
Connections
This 3U module comes with two power supply possibilities.
1. Power connection PWR is the standard Oakley 4-way 0.156” MTA socket. Friction lock
types are recommended. This system is backward compatible with MOTM and Blacet
systems.
Power
Pin number
+15V
1
Module GND
2
Earth/panel metal
3
-15V
4
Note that the third pin is separate to the main module ground. This is the standard Oakley
power specification and allows for the front panel to be grounded to earth at the power
distribution board rather than locally through the module. However, other than in Oakley
modular systems it is not widely used. See comment about the wire link below.
2. Power connection PSU is the 10 pin Doepfer style power supply connection. This is a 2 x 5
0.1” header and will fit 0.1” flat ribbon IDC sockets. +12V goes to the top two pins of the
header, that is the ones nearest the legend PWR. It is imperative that the power be supplied
correctly. Damage to the module will result if the power supply is connected up the wrong
way.
For Fractional Rack and Euro sized systems please solder a small wire link into the board
where it is labelled LK. This connects the module ground and earth together and will make
the module behave the same way as your other modules.
For assembly into Oakley 5U and 3U complete systems you can omit the wire link.
All audio connections are via a four way 0.1” header on the PCB called 'SKT'. This may be
different to other Oakley PCBs you may have built. Doing it like this allows you to remove
the board from the front panel easily, and allows the potential for additional socket boards to
be used in any future production run of the board.
You don't have to use a header in your PCB, you can solder your wires directly to the PCB
from the various socket lugs if you wish.
If you have used the little Cliff sockets you will see that they have four connections. One is
the earth lug or ground tag. The second is the signal tag which will be connected to the tip of
the jack plug when it is inserted. The third and fourth tag are the normalised tags, or NC
(normally closed) lugs. The NC lugs are each internally connected to the ground and signal
tags when a jack plug is not inserted. These connections should be automatically broken
when you insert a jack. Pushing a jack plug into an unconnected socket and looking carefully
at the various contacts will reveal the actions of the NC lugs. In this module we have no need
for either of NC lugs.
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