Behind the musical score, we drew on the box that
holds the circuit, and all the resistors and LED leads are soldered
together. To make sure that leads that get bent and touch don’t cause a
short, they need to be protected. Rather than using electrical tape, we
use liquid electrical tape to coat the exposed leads. Wires run between
the circuit board resting on the bottom of the box and the LEDs that you
insert in the top of the box. Be sure to cut your wires long enough so
that when you open the box (which moves the LEDs in the top farther away
from the circuit in the bottom of the box) that you don’t rip out the
wires. Also be careful that you leave room to tuck those long wires
inside the box when closed so they don’t poke out the sides or get
caught in the hinges. This is one case when stranded wires work better
than solid wires because they are more flexible.