can any one make a diy dehumidifier

does any body know of a way to make a home made de humidifier. ive never seen any body make one of these before so if theres any body that has made one post here or help me out my rooms way too humid and im flowering and ive already had some mildew that i sprayed with mildew cure. im going to respray then in the morning becuse im seeing a little more mildew. ive been spraying down the buds and the leaves and the plants look fine. thanks for rolling on by any advice would be savage

well my r h is now not an issue so just forget about this idea. just buy a real dehumidifier its an easy diy project.good luck to all growers that read my threads