ADAPTER 9V 1A POWER SUPPLY AC/DC for Arduino

The 9V 1A AC/DC Power Adapter is a high-quality regulated power supply designed to convert standard household AC mains power into clean, stable 9V DC output suitable for powering a wide range of electronic devices, microcontroller boards, and DIY projects. Engineered for safety, efficiency, and reliability, this adapter is the perfect companion for Arduino UNO, MEGA, Nano (with adapter), and other 9V-compatible development boards.

The adapter accepts a universal AC input voltage range of 100V–240V at 50/60Hz, making it compatible with electrical outlets in most countries worldwide (with the appropriate plug adapter or country-specific version). The switching power supply design efficiently converts AC to a clean, regulated 9V DC output with low ripple, ensuring stable operation of sensitive electronic circuits.

The output is delivered through a standard 5.5mm outer / 2.1mm inner barrel plug with center-positive polarity — the most common DC connector used in Arduino boards, hobby electronics, routers, modems, and small consumer devices. This plug fits directly into the DC power jack of Arduino UNO and MEGA, allowing you to power your projects without using the USB cable, which is especially useful for standalone deployments or projects requiring higher current than USB can provide.

With its 1A (1000mA) current rating, this adapter provides sufficient power for Arduino boards driving multiple LEDs, sensors, small motors, relays, and shields. The 9V input voltage is an ideal match for Arduino's onboard 5V regulator, falling within the recommended 7–12V operating range for optimal performance and minimal heat dissipation.

For safety, the adapter features comprehensive built-in protections:

• Over-Voltage Protection prevents output spikes that could damage sensitive electronics
• Over-Current Protection automatically limits current draw under heavy loads
• Short-Circuit Protection disconnects power instantly if a short circuit is detected
• Thermal Protection prevents overheating during prolonged operation

The adapter is housed in a compact, lightweight plastic case that is cool to the touch under normal operation, thanks to its energy-efficient switching design. The rounded edges and ventilation slots ensure safe and ergonomic handling, while the non-slip surface keeps it stable on desks and workbenches.

Whether you're developing your first Arduino project, deploying a finished prototype to a permanent installation, or simply need a reliable 9V power source for testing and bench work, this AC/DC adapter delivers the performance, safety, and convenience you need.

Specifications

• Type: Regulated Switching AC/DC Power Adapter
• Input Voltage: AC 100V – 240V (Universal)
• Input Frequency: 50 / 60 Hz
• Output Voltage: 9V DC (Regulated)
• Output Current: 1A (1000 mA)
• Output Power: 9 Watts
• Connector Type: DC Barrel Plug
• Connector Size: 5.5mm (Outer) × 2.1mm (Inner)
• Polarity: Center Positive (+)
• Plug Type: EU Plug (other types may be available)
• Cable Length: Typically ~120 cm
• Protections: Over-Voltage, Over-Current, Short-Circuit, Thermal
• Compatible With: Arduino UNO, MEGA, and other 9V devices
• Compliance: RoHS Compliant, CE Certified
• Quantity: 1 piece

Applications

• Arduino UNO, MEGA, and Compatible Boards — direct DC power jack input
• Sensor Modules & Shields — powering Arduino with multiple peripherals
• DIY Electronics & Prototyping — bench-top power supply for breadboards
• Microcontroller-Based Projects — ESP32, ESP8266, STM32 (with regulator)
• LED Lighting Projects — small 9V-tolerant LED strips and displays
• Routers & Modems — replacement power adapter for 9V network equipment
• Guitar Effect Pedals — most stompboxes use 9V center-negative (check polarity!)
• Audio Equipment — small mixers, microphones, and headphone amps
• Smart Home Devices — Arduino-based home automation hubs
• Robotics Prototypes — powering Arduino-based robot brains
• 3D Printer Auxiliary Boards — Arduino-based add-on modules
• Embedded System Development — workshop and lab use
• IoT Devices — powering ESP32/ESP8266 with onboard buck converter
• Educational & STEM Kits — classrooms and electronics workshops
• Test Equipment — DIY meters, oscilloscopes, and signal generators
• Replacement Power Supply — for damaged or lost adapters
• CNC Machine Add-ons — small Arduino-based control panels
• Permanent Installations — when a project moves from breadboard to enclosure
• Battery Eliminator — for devices that normally use 9V batteries
• DIY Audio Amplifiers — small low-power amp circuits