If your USB device ever suffers from noise caused by a ground loop or if you want to protect your PC against external voltages, then you need a USB isolator. Elektor’s USB Isolator, published in our October 2012 edition, offers an optimal electrical isolation of both the data lines as well as the supply lines between the PC and the USB device.   The project itself is a spin-off from an earlier design for a portable oscilloscope for Android. During the development of that project,...