The universal multicolour torch (flashlight)

Step 6 Preparing the circuit board and adding the LEDs

When I created the LED layout (see step 1) I chose to group the LEDs of each kind close together to make the wiring more convenient. I left the circuits lines of the common ground connected and cut the plus lines according to the layout scheme in step 2 using a standard cutter. Always check the contacts that you just separated with a voltmeter to make sure that you really disconnected them.

That done, I soldered the LEDs in. Except for the infrared LEDs, which are darker, all my LEDs have a clear housing so they look pretty much the same. Double-check the layout and the LEDs to avoid confusion here. Also remember to solder the LEDs in the correct polarity (flat side of the housing is ground).

As I had to cut a lot of plus lines, I finally had to solder some short pieces of wire to connect the plus lines within each group where needed.