Rapid digital single output bench dc power supplies hy3003d series rapid hy3003d the rapid hy3003d is a digital single output bench power supply this is very stable regulated output dc power supply allowing continuous adjustment of both the output voltage and current levelsthe lab grade power supply has two lcd displays allowing the output voltages and currents to be displayed simultaneously the voltage is variable from 0 to 30v the current is also variable from 0 to 3a the power supp