Living With Master-Slave
As you may be aware, there can be difficulties when using CDJ with players arranged in master slave configurations. This is due to the master player overriding CDJ's commands to the slave player on some occasions, causing it to stop playing or move to another disc.
The Simple Solution:
The basic solution is to break the master - slave relationship by placing the players on seperate S-Link busses where they cannot see each other. For many, this solution is unattractive as the master - slave functionality is now lost. This leads to....
The Better Solution:
A better solution is have the players connected together when not using CDJ, but on seperate S-Link busses when you are using CDJ. This allows everything to work right when you are using CDJ and normal master - slave functionality to be retained when CDJ is not running. Obviously, it would be inconvenient to be swapping cables around manually every time you wanted to use CDJ - you need a way to do this switching automatically...
A S-Link Switching Circuit
The circuit shown below allows you to connect and disconnect the two player's S-Link ports via CDJ control of the Slink-e. It works by using one of the Slink-e's digital I/O lines to turn on and off a relay which reconnects the 2 S-Link ports. The two states of the device can be described as follows:
Here's what you need to build. All of these parts are available at stores like Radio Shack. You could use 4 S-Link jacks as shown, or you could wire this circuit in-line with your S-Link cables.
CDJ needs to be told to activate this circuit when it starts and deactivate it when it finishes. To do this you need to take the following steps: