Working with EL Wire:
If you've never worked with EL wire, here' s the step-by-step process to soldering to this evil phospherous beast.
Before you go diving into an EL wire project, think about how the EL strands are going to connect to your controller. I highly recommend JST 2-pin friction connectors:
This type of JST connection will allow you to quickly remove a strand or remove a controller from the piece of clothing.
Step 1: Cut and strip the outer sheath
You can't even see the threads in this picture, but the way that EL wire works is there is a phospherous center core (the thick white wire in the picture above) and hair like wires that spiral around the core. If you strip the wire too harshly, you can easily cut through (or tear) the hair like wires. It takes practice. I recommend picking up an EL stripper. These stippers help, but it still takes practice.
Step 2: Scrape off some phosphor
Using an x-acto knife, scrape the phosphor from the core. In the picture above, you can see the two hair-like spiral wires.
Step 3: Solder the core
For my own sanity, I wired all the cores with red wire, and all the hair like wires with black wire. Remember to put the heat shrink on the red and black wires before you solder! I used tape to anchor everything while I was soldering. Worked well.
Step 4: Solder the hairs
Now carefully solder the hairlike wires. You can see I wrapped the hairs around the black, solid core wire. I used the x-acto knife blade to help coerce the hairs into place.
After soldering, shortly before heat shrinking.
Step 5: Heat shrink 'er
Notice the individual wires are heat shrinked. This helps give the hairs some support, and it also isolates the core connection from the hair connection. To shrink heat-shrink, I like to use a cheap heat gun. In a pinch, I have used matches or a lighter.
Step 6: More heat shrink
Adding a final overall sheath of heat-shrink will significantly add to the resiliance of the connection. These connections may seem very fragile at first, but I've beat up on these connections over the past two years. One connection has failed - it was the first one that I did and was pretty poor. A little practice and you'll be creating great, solid EL wire connections.