Some time in the second week of March I should take possession of my first audiophile grade listening kit. Which will include the DAC "Little Dot DAC_I Digital to Analog Converter" this is a DAC with its own power supply which does not draw any power from the USB line, but the input to it can come from USB. I presently listen to my music with a USB headset either right in front of my computer with its little monitor or on the other side of a 82 foot USB cable where I have my big-screen television. Initially I wish to move, my first owned, DAC back and forth between the two locations. The trouble is I do not know if the voltage swing at the end of my 82 foot USB repeater cable will be sufficient to drive my chosen DAC totally optimally. Consequently since I own an oscilloscope I would like to make a way of eavesdropping on this voltage swing.
So could anybody give me some good ideas in how you build an adapter that will let you eavesdrop on USB voltage swings? I mean if you could give me exactly what parts you would use that would be great. I would also want to know would you just use wires or some sort of crossbars or what? Exactly what you think would be the best way to build a USB voltage swing eavesdropper appropriate for an oscilloscope probe?
Edited by bbmiller - 2/19/14 at 8:16pm