re how do di boxes work lancer oconnor wpi edu stephe lewis foskett writes i m doing sound for a couple of bands around here and we need direct input boxes for the keyboards these are the little boxes that take a line level out of the keyboard and transform it into low z for the run to the mixer sadly they cost like or more each and i m going this is indeed one function but more sophisticated ones do level control and ground lift separating the keyboard and mixer earths aswell to need like or of them i looked inside one belonging to another band and it looks like just a transformer does anyone have simple ones are just that a transformer a decent quality audio trans former will cost most of that they are wired thus hot hot input from balanced out to mixer keyboard cold gnd gnd the ground lift switch disconnects the gnd line from the mixer the transformer ratio depends on the precise application but around turns ratio may be a good place to start christopher christopher hicks paradise is a linear gaussian world cmh uk ac cam eng also reported to taste hot and sweaty
