Irwin science powerbase v8 bench power supply unit psu irwin science powerbase v8 p the irwin powerbase v8 is a bench power supply unit psu and an updated version of the irwin powerbase 32 essentially it is the same as the 32 but has a higher power rotary transformer and a high specification toroid transformer replaces the original chassis transformer p p the unit supplies 0 to 20v smoothed dc and 0 to 16v ac at 8a the output is continuously variable and protected by a panel moun