Pedal Power Supply article
Pedal Power Supply for Beginners: A Complete Guide
Most guitar pedals run on 9V DC. Learn the basics of pedal power supplies and how to avoid common beginner mistakes that introduce noise or damage gear.
If you're building your first pedalboard, the power supply might seem like a minor detail compared to choosing pedals. But plugging your board into the wrong power supply can introduce hum, noise or damage to your gear. The good news: understanding pedal power supplies is simpler than it seems.
Most Pedals Use 9V DC
The vast majority of guitar pedals run on 9V DC (direct current) with negative-center polarity. This means negative connects to the inside of the barrel plug; positive is the sleeve. Your power supply must provide 9V in this configuration. Check your pedal's manual—the specifications are printed there. Never plug a 9V pedal into 12V power; it will be damaged instantly.
Start Simple: A Basic Daisy Chain
For a beginner board with three to five analog pedals, a daisy-chain power supply (£30–£60) is perfectly adequate. A single wall adapter sends power through a cable to each pedal in sequence. It's cheap, portable and gets the job done. As long as your pedals are all 9V negative-center and draw modest current (under 100 mA total), a daisy chain works fine.
Avoid Cheap Wall Adapters
A £5 wall adapter marked "9V" might be closer to 8V under load or have the wrong polarity. Cheap adapters also lack filtering, so they can introduce hum. Spend a little more on a proper daisy chain from a music equipment brand; it's worth the difference.
When to Consider Isolated Power
Once your board grows to include digital pedals (delays, reverbs, pitch shifters), an isolated power supply becomes worthwhile. Digital circuits draw more current and can introduce noise into a daisy chain. An isolated supply costs more (£150–£300) but delivers quieter boards and more reliable operation. For now, a daisy chain is fine; upgrade when you're ready.
The Important Takeaway
Match voltage, verify polarity and ensure the power supply can handle your pedals' current draw. Don't cheap out on the power supply; it's the foundation of a quiet, reliable board. A quality daisy chain costs £40–£60; that's money well spent.
Conclusion
Your first pedal power supply should be a reliable daisy chain matching your board's voltage and current requirements. As your board grows, you'll have a clearer sense of whether you need isolated power. For now, focus on getting the basics right: 9V negative-center, adequate current capacity, and a trusted brand. Everything else builds from there.
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