USB Printer Sharing Switch Circuit - Electronics Projects USB Printer Sharing Switch Circuit pcb schematic alternative link. FILE DOWNLOAD LINK LIST (in TXT format): LINKS-7003. Related Posts. Wind Turbines and Solar Panels Charge Control Circuit. Solar panel, wind turbine electricity production with free energy issues are very popular a few article for charging different circuits I. Simple USB Switch: 4 Steps - instructables With this switch I can keep my usb adaptor and power bank without unplugging and just switching on power failure. This usb switch will not use any energy so that I can save my battery life. USB switcher/hub available in the market have little circuit which consume power and I do not want to loose my power bank battery.