Sun Switch simple sun tracking electronic device

Step 3 Build a Soldering Jig

Build a jig by cutting a piece of ABS pipe and drilling holes to hold the LEDs in place for soldering. If you use a drill bit that is the same diameter as the LEDs the LEDs will fit into the drilled holes very snugly. You can experiment by drilling test holes untill you find the correct size drill bit.
Build two sets of LEDs making sure they are arranged in the correct polarity. You can use any light gauge wire but I have found that stranded wire works best because it is flexible.