Modifying the Board
Unsoldering existing caps
Look at the right of the board. There be a bunch of electrolytic caps
surrounding the DAC chip. The DAC is a small chip which has BB TI 1751
on the top. You are looking for caps c910 and c912. The numbers are
printed on both the top and bottom of the board.
Find the negative lead of cap c910 on both sides. This is what needs to
be disconnected. The easiest way to do this is place the soldering iron
tip on the pad on the bottom. Wait a couple seconds, then push the cap
over in the direction of the "+" pin. This will pull out the negative
lead. If that didn't pull it out completely, grasp the lead with long
nose pliers and heat up the pad on the underside, when the solder is
melted pull the lead out. You do not actually have to remove the "+"
lead, as long as the "-" lead doesn't touch anything keeping the cap on
the board is fine.
Do the same for cap c912.
Prepare the wire
Get your twisted pairs ready. Strip off the insulation just a very
tiny amount from the end of all 4 wires. Tin the exposed ends of each
wire. (Tinning is adding a little bit of solder to the wire, touch the
iron to the wire and touch the solder to the wire, it should melt and
cover the conductor)
Solder the wires to the bottom of the board
Solder one of the wires to the "-" pad of c910. There should be enough
solder on the pad that you don't need to add any extra. Place the wire
on the pad, then touch both with the iron, the solder on the wire
should melt in with the solder on the bad. Do the same for c912.
The two remaining wires get soldered to the negative pad of c902.
This pad is part of the large ground plane, it might take a little
extra heat to get the solder to melt.
I ran the wires through an extra hole on the board.
That's it! you are done with the modifications to the board.
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