Marble Maze Part 1- FAB Compartment

Fuse and Battery Compartment.

Since I made my marble maze, it always used a battery holder for 2 D cells. I figured out how to use a single 3 Volt lithium battery instead. In place of the 2nd battery, I put a piece of wood covered with foil tape and a screw at one end. This allows power to bypass where the 2nd battery would go. It's not enough voltage for a spark to jump the gap.

There is also a 9 volt battery clip to power a beeper and experiments that need more than 3 volts. The marble maze itself uses 3 volts for everything, but I made the table area include a breadboard for experiments.

I added a fuse because I read online that D batteries can supply 8 amps when shorted out, and I wanted to protect my wiring. One time, I shorted out a slot car track, and it melted the battery pack connector to the plastic track section. That was with 4 D batteries. This fuse is less than 1 Amp.

On the lid of the Fuse and Battery Compartment is a four AA battery holder. This doesn't power anything now, but it could be used for a snap circuit project or the breadboard.

FAB compartment with lid closed