Pedal Power Supply: A Complete Buyer's Guide

The difference between a cheap power supply and a good one shows up immediately when you start playing: noise, hum and unreliability. If you're buying a pedal power supply, understanding the specifications that matter will help you choose something that works well with your board instead of against it.

List Your Pedals' Requirements First

Before shopping, write down every pedal on your board and its voltage, polarity and current draw. Most pedals use 9V negative-center, but some differ. Check the manual or manufacturer's website—don't assume. Add up the total mA (current) requirement for each voltage tier. This is the foundation of your purchasing decision.

Daisy Chain or Isolated?

A daisy-chain supply costs less (£30–£80) but shares one power source and ground path across all connected pedals. This works for small boards of simple analog pedals with low power requirements. An isolated supply (£150–£400+) provides separate electrical paths for each output, eliminating ground-loop hum and digital noise. For boards mixing analog and digital effects, or containing more than five pedals, isolated is the safer choice.

Voltage and Current Specifications Matter

Choose a supply offering the voltages your pedals need. Current capacity is critical: your supply must provide at least the pedal's specified draw on each output. Undersized current is a common mistake that causes pedal malfunction or damage to the power supply. Having extra capacity is fine; having too little is a disaster.

Form Factor and Expandability

Consider where the power supply sits on your board. Is it compact enough? Do the output connectors reach the pedals without excessive cable strain? Will you expand the board later? Some supplies offer expansion via additional modules; others don't. Think about your board's future.

Trusted Brands

Strymon, Voodoo Lab, CIOKS, MXR and Truetone are established manufacturers known for reliable, quiet power supplies. They're more expensive than generic options, but the reliability and build quality justify the cost for serious players. Reviews specific to your board size help narrow the choice.

Conclusion

Buying the right pedal power supply means matching voltage, polarity and current capacity to your board's needs, then choosing between daisy-chain and isolated based on complexity. A good supply costs more upfront but delivers cleaner audio and years of reliable use. Cheap supplies introduce noise and create frustration that cost far more to fix later.