Do you mean like using voltage regulators? If so, you can step down and regulate a lower voltage using either a linear regulator or a buck DC-DC converter. And you can step up and regulate a higher voltage using a boost DC-DC converter. Info on voltage regulators can be found at the manufacturer's websites, like for Maxim and National Semiconducor.karim102 said:Hi,
I wanna ask if there D.c device that can step up or step down directly the Voltage. If there, can you show me and give me the design.