I have a project with old 18 segment vacuum fluorescent tubes. I provide 1.5 volts for the filaments, 48 volts on the anode, and 48 volts on the segment(s) and they light well. I want to light each segment independently using an IC (parallax propeller) that will use 3.3 volts to turn on or off each segment by way of an (NPN?) transistor. Any suggestions for the circuit or is there an easier way than transistors? Thanks!