Verify you have all the components shown here, and prep your solder station and tools.

Pre-bend the three resistors. This will make them easier to insert when soldering.

Insert the resistors into the board as shown. The orientation is not important.

Flip the board to the underside and solder the resistors. You can bend the legs outward to ensure they remain in place while upside down. Repeat this process for the remaining components.

Use wire cutters to trim down to the solder joint. Repeat this process for the remaining components.

When installing the 3 LEDs, the short leg must go into the white marking as shown. The orientation is critical.

In order to fit inside the 3D printed housing, the LEDs must bend to lie flat against the board as shown. Once in place, flip the board and solder them.

The housing should simply snap into place when pressed against the three holes in the center of the board.

The potentiometer pins only line up one way, as shown. Flip and solder.

The switch should be oriented to face outward as shown. When installing, be careful to use as little heat as possible since the switch can melt somewhat easily.

Flip the board to the underside and install the battery connector in this orientation as shown. Be careful not to install it backwards!

Plug in a 9-volt battery to the other end of the connector, and you're done! Thank you for building!