TIU/Barrel Jack Adapter Cable

a barrel jack is an incredibly common type of power conductor in consumer electronics you'll commonly see it on your wall warts which are basically just AC to DC converters these little things have transformers in them that step-down the 120 220 volt AC to something more usable like anywhere from a couple volts to a couple dozen volts and they also rectify using a full bridge rectifier usually with some nice smoothing capacitors they rectify the AC into DC so that it can go into your device now barrel jacks we're not talking about stuff like USB that's for devices that also communicate that's what USB is usually used for when things communicate now you'll also have USB chargers a lot of things charged by USB but that's just because it's easy you know USB is gonna be five volts it's just a cable the cables are interchangeable computers and phones and laptops are everywhere so USB is beco