Hi there,I'm working on the instructable you might be looking for right now. It's not finished yet, I still have steps to do, but here it is so far: https://www.instructables.com/id/E11LYA7FIG8OGELcheck the link to see when it shows up as published, which means it is complete.
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Here's an Instructable on the subject.
box with switches
each firework is wired in series with its switch
all of thoe links are wired to the battery in parallel
you disconnect the wires from the battery when you want to come close to the fireworks and dont want them to fly into your forehead