This standard sized DC female barrel fits most standard 2.1mm DC barrels. You can use this pigtail to connect a typical wall wart or DC barrel extension cable to your electronic project.
While typically a red positive wire is connected to the pin and a negative black wire is connected to the shield, you can flip these for some non-standard devices.
- Red is the center pin (almost always positive)
- Black is the shield (almost always negative)
- 2.1mm size (universal for most Arduinos and the Ardu32)
- 6 inches of pigtail
- Black and red wire are joined but can be pulled apart