BK Precision 1626A220V Digital Display DC Power Supply, 30V/3A, 220VAC Line Input. The BK Precision 1620A series are high-quality serial control type DC Regulated Power Supplies. These models can be operated at a constant voltage or constant current mode whose output can be varied from 0 up to the rated values for the respective model. This family of power supplies provides clean and stable DC output which is most suitable for many areas including laboratory, industrial, field service, hobby, and telecommunication applications.