Wooden Christmas tree with colour-changing lights

Step 10 Insert the LEDs and wire them up

Put a LED into each hole, with all the resistors facing in the same direction.

Now you need to connect all the resistor sides together using solid copper wire, and all the non-resistor sides using more solid copper wire, and none of these wires must cross over.

If you run a positive wire up one side of the tree, and a negative wire up the other side, then you can branch off and cross for each row of LEDs.

At the bottom of the tree, the fuse needs to be wired into one side of the circuit (it doesn't matter which side). Keep the fuse quite close to the power connector, as it won't protect the wire on the connector side of the fuse.

If the positive and negative wires must cross over somewhere, use some insulating tube or tape to keep them from touching. It's important to do this carefully to avoid any chance of causing a short-circuit that could at worst start a fire.

Twist the resistor/LED wires around the copper wire and solder together. Solder the resistor to LED connection too.

Use one or more white LEDs for the star at the top. Obviously you haven't got a nice round hole to keep these LEDs in place, so bend the various wires to keep the LEDs roughly in the right place.

If you have trouble keeping the LEDs in place while the wires are connected up, you could glue them in place first, but take care not to get glue where you'll later need to solder. A bit of glue squirted into each hole from the front side would probably hold them in place, if you can manage to hold each LED while the glue sets (take care - it's hot!).