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Reply to "4.5v dc power supply"

@zhubl posted:

In all honesty we’ve powered menards buildings with a straight 5VDC with no issue. We’re talking about a .5V difference to power lights. If anything else was involved I’d be triple checking everything. But it’s just LEDs that already have individual current limiting resistors. 

Usually supplies can be adjusted +/- 10% or so.  I would suggest an inline fuse off the power supply feed terminal "just in case" (OK probably fancy overkill) unless the supply has an internal current limiting foldback circuit, which it probably won't.

A half volt shouldn't cause harm as I can't imagine the buildings being designed explicitly to run on exactly 4.5V, given that in early days these buildings were running on cheapy unregulated supplies, whose output varied all over the place depending on the loadings.

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