Tdk lambda 200 432w single output variable dc power supplies switched mode bench tdk lambda z60 7l the tdk lambda z60 7l 420w single output variable dc power supply switched mode bench is a z device that impresses with rich features in a compact design which sets new standards with a size of just 70 x 83mm w x h the power supply provides two large displays and separate encoders for voltage and current along with extensive features on the rear side there is an integrated rs232rs48