DC 9V 1a Power supply (5.5mm barrel jack)

This AC/DC power adapter provides a stable 9V DC output at up to 1A, making it suitable for powering microcontroller boards like Arduino, Nixie tube clocks, and other low-power electronics. It features a standard 5.5mm x 2.1mm barrel jack connector with center-positive polarity, a common interface for maker projects and development kits. The unit accepts a universal AC input (typically 100-240V) and ensures a clean DC supply to prevent voltage drops or noise interference in sensitive circuits.