The FEI units use two paralleled low dropout regulators to drop the 15V input
voltage down to 14V. There is also a series protection diode that drops some
more voltage. Combined you need at least 14.7V input. Anything less and the
regulators will not regulate and the unit will not work within spec. Anything
much more than 15V and the regulators will overheat (you can supposedly go to
18V, but I would not do it without lots of cooling).
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