1. Product Overview
The ELEGOO AC 100V-240V Converter Adapter is a regulated 9V 1A DC power supply designed for various electronic projects and devices. It features a US plug and a 5.5mm x 2.1mm barrel connector with a center-positive polarity. This adapter is certified by UL, FCC, and CE, ensuring safety and quality.

Image 1.1: The ELEGOO 9V 1A AC/DC Power Adapter, showing the US plug and barrel connector.
Key Features:
- Fully US Regulated Power Supply Adapter.
- Center-positive polarity (5.5mm x 2.1mm barrel connector).
- Automatically converts international voltages (100V-240V AC input).
- Provides up to 1A output at 9V DC.
- UL, FCC, CE certified for safety.
2. Compatibility
This power adapter is designed for devices requiring 9V DC power with a maximum current draw of 1000mA (1A) and a 5.5mm x 2.1mm center-positive barrel connector. It is compatible with:
- Arduino UNO R3
- Arduino Mega 2560
- Arduino 1280
- Arduino CCTV
- Other devices that require 9V and 1000mA DC power with a 5.5mm x 2.1mm center-positive plug.

Image 2.1: Visual representation of compatible and incompatible devices, highlighting the 5.5mm x 2.1mm connector size and center-positive polarity.
Important Note: This adapter is NOT suitable for:
- Effects Pedals, Drum machines, DJ controllers, Piano keyboards, Label makers, and other equipment with negative-tip power ports.
- Devices that require minimal electromagnetic interference, such as radio sets.
- Devices requiring a different voltage, current, or connector size (e.g., 5.5mm x 2.5mm).

Image 2.2: Guide on how to select the correct power adapter by verifying voltage, current, and interface (connector size).

Image 2.3: Diagram illustrating the center-positive polarity of the barrel connector, where the inner pin is positive and the outer sleeve is negative.
3. Setup and Installation
- Verify Device Requirements: Before connecting, ensure your device requires 9V DC power, draws no more than 1A, and uses a 5.5mm x 2.1mm center-positive barrel connector. Incorrect voltage, current, or polarity can damage your device.
- Connect to Device: Insert the barrel connector of the ELEGOO power adapter into the DC input jack of your compatible device.
- Plug into Power Outlet: Insert the US plug of the power adapter into a standard AC 100V-240V wall outlet.
- Power On Device: Once connected, power on your device as per its own instructions.
The adapter is designed for simple plug-and-play operation. No additional configuration is typically required.
4. Operating Instructions
Once properly set up, the ELEGOO 9V 1A power adapter operates automatically. It provides a stable 9V DC output to your connected device. The adapter features a Multi-Protect safety system to ensure complete protection for both the adapter and your devices.

Image 4.1: Internal view of the power adapter, illustrating the components responsible for its superior safety features like short circuit prevention and surge protection.
Safety Features:
- Short Circuit Prevention
- Current Stabilizer
- Temperature Control
- Surge Protection
5. Maintenance
To ensure the longevity and optimal performance of your ELEGOO power adapter, follow these simple maintenance guidelines:
- Keep Clean: Wipe the adapter with a dry, soft cloth. Avoid using liquid cleaners or solvents.
- Avoid Physical Damage: Do not drop, bend, or expose the adapter to excessive force. Ensure the cable is not kinked or pinched.
- Storage: Store the adapter in a cool, dry place away from direct sunlight and extreme temperatures when not in use.
- Unplug When Not in Use: For extended periods of non-use, unplug the adapter from both the wall outlet and the device.
6. Troubleshooting
If you encounter issues with your ELEGOO power adapter, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. |
|
|
| Adapter gets unusually hot. |
|
|
| Connector does not fit. | Incorrect connector size. | Verify your device requires a 5.5mm x 2.1mm barrel connector. This adapter is not compatible with 5.5mm x 2.5mm or other sizes. |
If the problem persists after attempting these solutions, please contact ELEGOO customer support.
7. Specifications
| Feature | Detail |
|---|---|
| Brand | ELEGOO |
| Model Number | EL-CP-026 |
| Input Voltage | AC 100V-240V |
| Output Voltage | DC 9V |
| Output Current | 1A (1000mA) |
| Wattage | 15 Watts |
| Connector Type | Barrel Connector |
| Connector Size | 5.5mm x 2.1mm |
| Polarity | Center Positive |
| Plug Type | Type A - US style (2 Pin) |
| Certifications | UL, FCC, CE |
| Material | Plastic |
| Color | White |

Image 7.1: Official certifications for the ELEGOO power adapter, including UL, TUV, and CE.
8. Warranty and Support
Warranty Information:
This ELEGOO power adapter comes with a 6-month warranty from the date of purchase. This warranty covers manufacturing defects under normal use. It does not cover damage caused by misuse, accident, unauthorized modification, or improper installation.
Customer Support:
For technical assistance, warranty claims, or any questions regarding your ELEGOO product, please contact ELEGOO customer support through their official website or the platform where the product was purchased. Please have your model number (EL-CP-026) and purchase details ready when contacting support.
You can visit the official ELEGOO store for more information: ELEGOO Official Store