A power supply for guitar pedals is a device that provides consistent and reliable electrical power to multiple effects pedals simultaneously. It eliminates the need for individual batteries or multiple AC adapters, simplifying pedalboard setup and reducing cable clutter. Here are some key features and considerations when choosing a power supply for guitar pedals:

1. **Multiple Outputs**: A power supply should have multiple outputs to accommodate the various power requirements of different pedals on your pedalboard. Outputs may include standard 9V DC outputs, as well as higher voltage outputs for pedals that require them.

2. **Voltage and Current Ratings**: Each output should provide the correct voltage and current rating to match the requirements of the pedals connected to it. Most pedals operate on 9V DC, but some may require different voltages or higher current ratings. Make sure the power supply can deliver enough power for all your pedals.

3. **Isolation**: Isolated outputs provide separate electrical paths for each pedal, eliminating ground loops and minimizing noise and interference. This helps maintain the integrity of your guitar signal and ensures clean, noise-free operation, especially when using high-gain or sensitive pedals.

4. **Daisy Chain Compatibility**: Some power supplies offer a combination of isolated outputs and daisy chain outputs. Daisy chain outputs allow you to connect multiple pedals to a single output using a daisy chain cable, which can be convenient for low-power pedals or when all pedals share the same power requirements.

5. **Compact Size and Mounting Options**: Consider the size and form factor of the power supply to ensure it fits comfortably on your pedalboard. Some power supplies are designed to be mounted underneath the pedalboard for a clean and tidy setup, while others may sit on top or alongside the pedals.

6. **Overload Protection**: Look for power supplies with built-in overload protection to prevent damage to your pedals in case of power surges or short circuits. This can help prolong the lifespan of your pedals and provide peace of mind during performances.

7. **Compatibility with International Power Standards**: If you plan to use your pedalboard internationally, make sure the power supply is compatible with different AC voltages and plug standards. Some power supplies offer switchable voltage settings or come with adapters for use in different regions.

Overall, a reliable power supply is essential for powering your guitar pedals and ensuring consistent performance without noise or interference. Choose a power supply that meets the specific needs of your pedalboard setup, provides adequate power for your pedals, and offers features like isolation and overload protection for optimal performance and reliability.