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UHVDC transformer maintenance vacuum electronic weighing device

US5442259A - Power supply for vacuum fluorescent displays ... power supply for a large or dual vacuum fluorescent display having a DC source coupled to a switching regulator to generate a stepped up DC voltage. A -5 volt regulator is coupled to the switching regulator output, to provide a second DC voltage. A grid and segment driver is supplied with the regulator output. The driver is coupled to a microprocessor, and selectively drives the grid and ...

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