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9V 1A AC to DC Power Supply Adapter (5.5mm x 2.1mm Barrel Jack)

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When your electronics project outgrows the standard 5-Volt USB power or requires a higher voltage for motor drivers and analog sensors, this 9-Volt, 1-Amp AC to DC power adapter is the perfect solution. Designed to convert fluctuating household AC wall power into a clean, stable 9-Volt DC output, it acts as the primary lifeblood for a massive variety of hobbyist and commercial electronics. It is specifically famous for being the absolute standard, highly recommended power supply for classic development boards like the Arduino Uno and Arduino Mega.

Equipped with the universally recognized 5.5mm by 2.1mm center-positive barrel plug, this adapter offers true plug-and-play convenience. Capable of delivering up to 1 Amp (1000 milliamps) of continuous current, it provides more than enough power to run a microcontroller alongside several peripheral modules, LCD screens, or small DC motors without experiencing the voltage sag that causes logic chips to randomly reset. Built with internal switching technology, it ensures efficient power delivery while remaining remarkably cool during continuous operation.

Key Features & Functional Advantages

  • Universal Input Voltage: Readily accepts AC wall power ranging from 100 Volts to 240 Volts, making it functional worldwide without needing a heavy step-down transformer.

  • Standardized Connector: Features the industry-standard 5.5mm outer diameter and 2.1mm inner diameter DC barrel jack, ensuring instant compatibility with countless development boards and consumer devices.

  • Center-Positive Polarity: Wired in the modern standard configuration where the inner tip of the plug carries the positive voltage, protecting standard devices from reverse-polarity damage.

  • Clean Power Delivery: Utilizes internal switching technology to provide a smooth, regulated 9-Volt output that keeps sensitive digital logic chips and on-board voltage regulators perfectly stable.

  • Built-in Protections: Engineered with internal safeguards against short circuits, over-current draws, and overheating, preventing damage to both the adapter and your connected electronics.

Perfect For

  • Arduino Development: The absolute standard wall power supply for providing the perfect input voltage directly to the barrel jack of an Arduino Uno, Mega, or Leonardo.

  • Motor Controllers: Providing the higher voltage necessary to drive small robotics motors via an L298N or similar motor driver module.

  • Network Equipment: Serving as a reliable replacement power supply for household routers, modems, and network switches that require 9 Volts.

  • DIY Electronics: Powering custom breadboard power supply modules that require a DC input greater than 5 Volts to regulate properly.

Technical Specifications

  • Device Type: AC to DC Wall Power Supply

  • Input Voltage: 100 Volts to 240 Volts AC (50/60 Hertz)

  • Output Voltage: 9.0 Volts DC

  • Maximum Output Current: 1.0 Amp (1000 milliamps)

  • Maximum Output Power: 9 Watts

  • Connector Type: 5.5mm x 2.1mm DC Barrel Plug

  • Polarity: Center-Positive

Ensure your order is placed by 2PM to guarantee next-day delivery! Our commitment to prompt service includes a 24-hour delivery system through our network of carriers, aimed at ensuring your package arrives right on schedule.

Please note, a delivery fee of €4.99 applies for orders under €50. For those in remote areas, be aware that our couriers may apply an extra surcharge. This additional fee helps cover the costs of transporting your items to harder-to-reach locations.