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Signs with chasing lights had a drum and electric motor that turned the drum.

So then that _IS_ how they work?!?!

When I was a kid I'd stand under the metal awnings of some grocery stores with chasing lights around the rim and I'd hear a constant mechanical whir-whirr clank clank in rythm with the lights.

I always thought it would be something similar to what you described [Linked Image]

Are these devices still made or have they been replaced by some sort of solid-state thing?