Simple plug adapter that comes in handy when you have power supply with 5.5/2.1 mm plug and device with 5.5/2.5 mm connector. Of course, you'll still have to check if both devices are center positive (most common case) or center negative (rarely, but it happens).
Simple plug adapter that comes in handy when you have power supply with 5.5/2.5 mm plug and device with 5.5/2.1 mm connector. Of course, you'll still have to check if both devices are center positive (most common case) or center negative (rarely, but it happens).
Most Arduinos have 5.5x2.1 mm socket, but sometimes you'll have a power supply with 5.5x2.5 mm plug (most 'desktop' PSU have this plug) and then you can use this socket for your project.