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Jun 15, 2014 at 3:28 comment added Malvineous @Passerby: Don't forget the third voltage differential you can get between -15V and +15V!
Jun 15, 2014 at 3:16 history edited JYelton CC BY-SA 3.0
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Jun 14, 2014 at 7:22 comment added Passerby @MichaelKaras you get two Voltage differentials, but three voltage levels.
Jun 14, 2014 at 2:04 comment added Michael Karas Please help to make your answer better by making it more clear that you get TWO voltages out of a +/-15V unit and ONE out of a 30V supply.
Jun 14, 2014 at 1:27 history answered Haresh K CC BY-SA 3.0