[time-nuts] FE 5680A supply voltage

[Mark Sims]

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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