"DC Fan" 9141 double coil winding, when the work is controlled by Schmitt trgger both transistors turned on and off to control the coil off (output half-wave), and 319 single-coil, starting current small, two-way type H output drive, four transistors by controlling the on-off control the direction of current in the coil (the output of full-wave). Products using air guide channel and spacers and the stator as a whole, such a simple structure, installation is easy to use. The appliance industry, machinery industry, equipment manufacturing industry and other ventilation requirements of the products are widely used in DC fan.