Block vcm pcb mount dual output transformers block vcm 5 0 2 9 the block vcm pcb mount transformer 5va 2 x 9v 2 x 555ma is ideal for adjustment of the voltage and simple electrical isolation while also acting as a safety isolating transformer for the safe electrical isolation of the input and output sides suitable for creating selv and pelv circuits because of the limit on the output voltage p designed with excellent size to power ratio with mounting tabs on side of housing this high qu