It works fine without any front cover. “Colossus” uses white foam-core dividers to make many individual reflective cavities, covered with two layers of white bed sheet as a front-surface diffuser.

and half of an LM358 which forms a comparator against a static voltage from a divider. The LM358’s output drives a MOSFET which in turn switches on or off the fan motor. This type of circuit ...

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