> ## Content Index > Fetch the complete content index at: https://cowon.net/llms.txt > Use this file to discover other available public pages before exploring further. # Best Pedalboard Power Supply for Gigging Guitarists - URL: https://cowon.net/best-pedalboard-power-supply/ - Published: 2026-09-07T07:22:12.000Z - Updated: 2026-09-07T09:49:17.000Z - Description: Five pedalboard power supplies compared on isolated outputs, voltage options and current, with a clear winner for most rigs and honest picks for tighter budgets. - Author: Frederick Cameron - Tags: Audio & Home Theater, #Guitar, #Pedalboards The best pedalboard power supply for most players is the **Donner DP-1**, a 6.9 oz brick with 10 isolated DC outputs covering 9V, 12V and 18V from a single 100–240V input. If you want a lighter unit with a stated one-year warranty and a USB port for a tuner or a phone, the **RVONE RPS-20** at 3.17 oz is the better call. Everything below flows from one question: does your board actually need isolated outputs, or will a single 9V adapter do? In this guide 1. [Best pedalboard power supply at a glance](#best-pedalboard-power-supply-at-a-glance) 2. [How I narrowed the field to five](#how-i-narrowed-the-field-to-five) 3. [What actually decides a pedalboard power supply?](#what-actually-decides-a-pedalboard-power-supply) 4. [1\. Donner DP-1 — Best overall](#1-donner-dp-1-%E2%80%94-best-overall) 5. [2\. RVONE RPS-20 — Best for pros](#2-rvone-rps-20-%E2%80%94-best-for-pros) 6. [3\. D'Addario PW-CT-9V — Best budget pick](#3-daddario-pw-ct-9v-%E2%80%94-best-budget-pick) 7. [4\. MXR DC Brick M237 — Best premium](#4-mxr-dc-brick-m237-%E2%80%94-best-premium) 8. [5\. Mosky 10-Output Supply — Runner-up](#5-mosky-10-output-supply-%E2%80%94-runner-up) 9. [Isolated outputs, milliamps and the noise question](#isolated-outputs-milliamps-and-the-noise-question) 10. [How many pedals can each one really run?](#how-many-pedals-can-each-one-really-run) 11. [What the product listings do not tell you](#what-the-product-listings-do-not-tell-you) 12. [Donner DP-1 vs MXR DC Brick: which wins?](#donner-dp-1-vs-mxr-dc-brick-which-wins) 13. [The verdict](#the-verdict) 14. [FAQ](#faq) ## Best pedalboard power supply at a glance | Pick | Isolated outputs | Voltages | Price | | --------------------------------------------------------------------------------------------- | ---------------- | -------------- | ------------------------------------------------------------------ | | **Best overall**[Donner DP-1](https://www.amazon.com/dp/B00WHLLDWO?tag=cowonhq-20) | 10 | 9V / 12V / 18V | [Check Price](https://www.amazon.com/dp/B00WHLLDWO?tag=cowonhq-20) | | **Best for pros**[RVONE RPS-20](https://www.amazon.com/dp/B0DRP1MW82?tag=cowonhq-20) | 10 + USB | 9V / 12V / 18V | [Check Price](https://www.amazon.com/dp/B0DRP1MW82?tag=cowonhq-20) | | **Best budget pick**[D'Addario PW-CT-9V](https://www.amazon.com/dp/B00191WVF6?tag=cowonhq-20) | Single output | 9V only | [Check Price](https://www.amazon.com/dp/B00191WVF6?tag=cowonhq-20) | | **Best premium**[MXR DC Brick M237](https://www.amazon.com/dp/B00B5I9GYW?tag=cowonhq-20) | 10 (8×9V, 2×18V) | 9V / 18V | [Check Price](https://www.amazon.com/dp/B00B5I9GYW?tag=cowonhq-20) | | **Runner-up**[Mosky 10-output supply](https://www.amazon.com/dp/B08PB5TYKS?tag=cowonhq-20) | 10 + USB | 9V / 12V / 18V | [Check Price](https://www.amazon.com/dp/B08PB5TYKS?tag=cowonhq-20) | ## How I narrowed the field to five Most guides on the best pedalboard power supply throw twenty units at you and let you sort it out. That is the wrong job. The category splits cleanly by what your board actually needs, so I cut on hard criteria first and only then ranked what was left. Two disqualification rules did most of the work. First, if a listing did not publish either a total output count or a voltage list, it went out. You cannot plan a board from marketing copy alone. Second, if the unit only offered a single voltage and a single output, it stayed in the running only as a budget option for all-9V boards, not as a serious contender. That left five units worth comparing: 1. Two 10-output isolated bricks with 9V, 12V and 18V options: the Donner DP-1 and the RVONE RPS-20. 2. One US-built 10-output brick with 9V and 18V only: the MXR DC Brick M237. 3. One 10-output isolated supply with adjustable outputs and a USB port: the Mosky. 4. One single-output 9V adapter for small boards: the D'Addario PW-CT-9V. Ranking then came down to voltage flexibility, published current per output, weight, and whether the maker publishes a real warranty. The picks below reflect that order. ## What actually decides a pedalboard power supply? Guitarists compare total output count first. That is the wrong number. What decides the purchase is the combination of **isolated outputs, current per output in milliamps, and voltage options**. A unit with ten outputs that all share a rail is not the same as ten isolated ones. Isolation is what stops one noisy pedal bleeding hum into the next. Here is the trick most shoppers miss. A digital delay or reverb can pull 250–500mA on its own. If your supply gives each output only 100mA, you cannot run that pedal from it, no matter how many outputs are on the box. Read the per-output current, not the total. Voltage matters next. A modern board often mixes 9V analog pedals with a 12V modulation or an 18V overdrive for extra headroom. A 9V-only adapter locks you out of both. That is why the D'Addario is a budget pick, not the winner: it does one voltage well and nothing else. The Donner, RVONE and Mosky cover 9V, 12V and 18V. The MXR covers 9V and 18V but not 12V, which is a real limit if you own a 12V pedal. ## 1\. Donner DP-1 — Best overall **The Donner DP-1 wins because it publishes the widest useful spec sheet at a mid-range price position: 10 isolated outputs across three voltages, in a 6.9 oz aluminum body.** [![Donner DP-1 pedalboard power supply with 10 isolated DC outputs — the pick with the widest published voltage and current spread](https://m.media-amazon.com/images/I/51ccAyJ9Q7L._SL500_.jpg)](https://www.amazon.com/dp/B00WHLLDWO?tag=cowonhq-20) **Best for:** a mixed board of 9V, 12V and 18V pedals up to about eight or nine slots. **Skip it if:** you run mostly high-current digital pedals that need 300mA or more each. The output map is the reason it leads. Donner publishes seven 9V 100mA outputs, one 9V 500mA output, one 12V 100mA output and one 18V 100mA output, all fed from an AC 100–240V input. That gives you a high-current slot for a digital delay, a 12V slot for a modulation, and an 18V slot for headroom, without a second supply. Weight comes in at 6.9 oz, so it will not weigh down a small board. Donner says the unit uses a noise-reduction circuit and independent short-circuit protection on each output, with a blue LED for pedalboard lighting and short indication. Those are the maker's claims, not a measurement, but they line up with what you expect at this price position. Ten power cables ship in the box. The trade-off is current. Most 9V outputs sit at 100mA. If your board is stacked with modern DSP pedals, you will run out of headroom on the low-current outputs before you run out of slots. **Pros:** - 10 isolated outputs across 9V, 12V and 18V - One high-current 9V 500mA output for digital pedals - Light 6.9 oz aluminum body - Universal 100–240V input for touring - Short-circuit protection claimed on each output **Cons:** - Seven of the 9V outputs are only 100mA - No published warranty period - Only two sellers list it here [Check Price on Amazon](https://www.amazon.com/dp/B00WHLLDWO?tag=cowonhq-20) ## 2\. RVONE RPS-20 — Best for pros **The RVONE RPS-20 is the pick for gigging players because it is the lightest 10-output supply in this set at 3.17 oz and carries a stated one-year warranty.** [![RVONE RPS-20 neon green pedalboard power supply — the lightest 10-output unit here](https://m.media-amazon.com/images/I/41T6lQQHguL._SL500_.jpg)](https://www.amazon.com/dp/B0DRP1MW82?tag=cowonhq-20) **Best for:** gigging players who want a light, warrantied unit with a USB port for a tuner or phone. **Skip it if:** you need a metal-brick build with a long factory warranty on the electronics. At 3.17 oz, the RPS-20 is less than half the weight of the Donner DP-1 and roughly a fifth of the MXR DC Brick. On a fly rig or a small pedaltrain, that difference is real. RVONE lists 10 isolated outputs for 9V, 12V and 18V pedals plus a USB output to charge a phone or run a low-draw accessory. An 18V power adapter feeds the unit. RVONE says the RPS-20 uses a built-in noise filter and a noise-canceling chip, and that each output has its own indicator so you can see the power status at a glance. Short-circuit protection is claimed per output. It is also the only pick here with a clear one-year warranty published on the listing, which is useful reassurance for a working player. The trade-off against the Donner is that the exact current per output is not laid out in the same clean way, and the neon green casing will not suit every board. It is second-cheapest in this set, which makes the weight and warranty story stronger, not weaker. **Pros:** - Very light at 3.17 oz - 10 isolated outputs for 9V, 12V and 18V - USB output for a tuner or phone - Stated 1-year warranty - Per-output indicator lights **Cons:** - Neon green finish will not suit every board - Per-output current not fully broken down on the listing - Only one seller lists it [Check Price on Amazon](https://www.amazon.com/dp/B0DRP1MW82?tag=cowonhq-20) ## 3\. D'Addario PW-CT-9V — Best budget pick **The D'Addario PW-CT-9V is the right call for a small, all-9V board that needs a reliable wall adapter and nothing more, at the cheapest position in this set.** [![D'Addario PW-CT-9V power adapter — a single-output 9V supply rated to 800mA](https://m.media-amazon.com/images/I/41Wv8qg5ZML._SL500_.jpg)](https://www.amazon.com/dp/B00191WVF6?tag=cowonhq-20) **Best for:** a small, all-9V board that just needs to run without dying mid-set. **Skip it if:** you have any 12V or 18V pedal, or need isolated outputs. This is not a brick. It is a single-output 9V DC adapter, 1.76 oz, with dimensions of 1.57 x 4.72 x 3.15 in. D'Addario states it delivers up to 800mA at 9V, which is enough headroom to run a small chain through a daisy-chain cable if the pedals tolerate a shared rail. The adapter converts AC wall power to 9V DC and can also power tip-negative keyboards, per the listing. D'Addario says the unit is replaced if defective. It is the cheapest of the five and it is the one buyers pick up most often in this set by a wide margin, which tells you something honest: most guitarists with a small board do not need a multi-output brick. They need a working 9V adapter. This does that job. The catch is obvious. There is only one output, one voltage, and no isolation. Plug in a 12V modulation and you are out of luck. Add a digital pedal that draws 500mA and you have already eaten most of the budget for the rest of the daisy chain. **Pros:** - Cheapest pick in this set - Rated up to 800mA at 9V - Very light at 1.76 oz - Compact 1.57 x 4.72 x 3.15 in footprint - Also powers tip-negative keyboards per the listing **Cons:** - Single output only, no isolation - 9V only, no 12V or 18V option - Warranty is a defect replacement, not a stated term - Not a pedalboard brick in the multi-output sense [Check Price on Amazon](https://www.amazon.com/dp/B00191WVF6?tag=cowonhq-20) ## 4\. MXR DC Brick M237 — Best premium **The MXR DC Brick M237 is the premium pick for players who want a US-built brick with a formal one-year Dunlop electronics warranty and eight 9V plus two 18V outputs.** [![MXR DC Brick M237 silver power supply — a US-built brick with eight 9V and two 18V outputs](https://m.media-amazon.com/images/I/416hp47I+xL._SL500_.jpg)](https://www.amazon.com/dp/B00B5I9GYW?tag=cowonhq-20) **Best for:** players who want a US-built brick with a one-year electronics warranty and headroom for 18V pedals. **Skip it if:** your board is small or you want the lightest possible unit. MXR publishes a clear output map: eight 9V outputs and two 18V outputs, ten in total. Each 9V output has a red LED that lights up on a short. MXR says this generation handles twice the power of the original DC Brick, and the listing confirms US country of origin. The Dunlop warranty statement covers defective workmanship or materials for one year from purchase, which is the most complete warranty text in this set. Weight is 1.55 lb in a 2.7 x 9.2 x 4.3 in silver housing. That is the heaviest brick here by a clear margin, and it is the most expensive of the five. What you buy for that is a real manufacturer warranty, US assembly, and a build reputation that has been part of pro boards for years. The trade-off is what MXR left out. There is no 12V option, so if you own a 12V modulation pedal, this brick cannot power it directly. The unit is also the most expensive pick here for a smaller voltage spread than the Donner offers. **Pros:** - Ten outputs: eight 9V and two 18V - Per-output red LED short indicator - Stated 1-year Dunlop warranty - US country of origin per the listing - Reputation-heavy brand for pro rigs **Cons:** - No 12V output, unlike the Donner and RVONE - Heaviest unit here at 1.55 lb - The most expensive pick in this set - Larger 2.7 x 9.2 x 4.3 in footprint [Check Price on Amazon](https://www.amazon.com/dp/B00B5I9GYW?tag=cowonhq-20) ## 5\. Mosky 10-Output Supply — Runner-up **The Mosky rounds out the shortlist with 10 isolated outputs, adjustable 9V/12V/18V ports and a USB output, though its published spec sheet is thinner than the others.** [![Camola Mosky pedalboard power supply with 10 isolated DC outputs and USB port — a flexible adjustable-voltage option](https://m.media-amazon.com/images/I/51eequuOqOL._SL500_.jpg)](https://www.amazon.com/dp/B08PB5TYKS?tag=cowonhq-20) **Best for:** a board that needs adjustable 9V/12V/18V outputs plus a USB port. **Skip it if:** you want a fully published spec sheet with weight and dimensions. The output map is genuinely useful. Mosky says the unit ships with seven 9V 300mA ports, one 9V 500mA port, and two 9V/12V/18V 500mA adjustable outputs, plus a USB port and a polarity-reversing adapter. That is a stronger current profile on the standard 9V outputs than the Donner DP-1's 100mA slots, and the adjustable ports mean one physical output can serve different pedals as your board changes. Mosky says each output has its own short-circuit and over-current protection and that the case includes a built-in noise filter and denoising chip. LEDs on each output go out when a short is detected. The listing describes the unit as designed specifically for guitar effect pedal use. The reason this pick is a runner-up rather than higher is the data itself. The listing does not publish a clear weight, a clear dimensions figure, or a warranty term. It is also the second-most expensive pick here. If you value the adjustable voltage feature strongly, it is worth a look. If you want to compare specs cleanly across bricks, the Donner and RVONE make that easier. **Pros:** - Seven 9V 300mA outputs plus one 9V 500mA - Two adjustable 9V/12V/18V 500mA outputs - USB port and polarity-reversing adapter included - Per-output short and over-current protection claimed - Adjustable voltage flexibility **Cons:** - No published weight or clear dimensions - No stated warranty term - Second-most expensive pick here - Only one seller lists it [Check Price on Amazon](https://www.amazon.com/dp/B08PB5TYKS?tag=cowonhq-20) ## Isolated outputs, milliamps and the noise question Isolated outputs matter because ground loops are the main source of pedalboard hum. When two pedals share a power rail, digital noise from one can leak into the audio path of another. An isolated output gives each pedal its own transformer winding, so the noise floor stays low. Four of the five picks here claim isolated outputs: the Donner DP-1, RVONE RPS-20, MXR DC Brick M237, and the Mosky. The D'Addario PW-CT-9V is a single-output adapter, so isolation is not on the table. Current per output is the other half of the equation. Rough draws to plan around: - Analog dirt and boost pedals: often 10–50mA at 9V. - Analog delay, chorus, tremolo: often 30–100mA at 9V. - Digital delay, reverb, multi-effects: often 200–500mA at 9V. - 18V-capable overdrives run at 18V: typically low current, but need the higher voltage. Match the loudest-drawing pedal on your board to the highest-current output on the brick. If the numbers do not fit, you need a different brick or a Y-cable to combine two isolated outputs, if the maker allows it. ## How many pedals can each one really run? The output count on the box is not the same as the number of pedals the brick can power. Total current draw is what matters. A quick rule of thumb, based on what the makers publish: - **Donner DP-1**: seven 9V 100mA slots plus one 9V 500mA slot, one 12V 100mA and one 18V 100mA. Comfortable for a board of light analog pedals plus one heavier digital box on the 500mA output. - **RVONE RPS-20**: 10 isolated outputs for 9V, 12V and 18V with a USB port, fed by an 18V adapter. Best matched to a mixed board where per-pedal draws stay moderate. - **D'Addario PW-CT-9V**: one 9V output up to 800mA. Split with a daisy chain and you can power several low-current analog pedals, but any real board will outgrow it. - **MXR DC Brick M237**: eight 9V outputs and two 18V outputs, and MXR says this generation handles twice the power of the original. The strongest option for 18V-hungry boards without 12V pedals. - **Mosky**: seven 9V 300mA plus one 9V 500mA plus two adjustable 9V/12V/18V 500mA. On paper the most current-flexible of the bricks here. Count your pedals. Then add the milliamps. Then pick the brick. ## What the product listings do not tell you Product listings are marketing pages, so some of what a working guitarist wants to know is not there. Three examples worth flagging. First, none of these listings publish independent noise-floor figures. Makers say "noise reduction" and "noise filter", but a measured noise floor in dBu is not something these pages give you. Treat isolation as the objective feature and noise-reduction claims as the maker's statement. Second, mounting is barely covered. If you plan to Velcro or bracket a brick to the underside of a pedaltrain, the height clearance matters. Only the D'Addario, Donner, MXR and RVONE publish enough dimensional data to plan mounting; the Mosky listing does not. Third, cable length and connector polarity are not always spelled out. The Donner ships with ten power cables. Others mention accessories in passing. If your rig has an oddball connector, check the fine print before you buy. The general rule with a pedalboard power supply is that a shorter, cleaner spec sheet is often a sign of a lighter product page, not a better product. Compare like with like where you can, and treat the rest as unknowns until proven otherwise. ## Donner DP-1 vs MXR DC Brick: which wins? The Donner DP-1 and the MXR DC Brick M237 are the two most credible ten-output bricks here, and they answer the same question in different ways. The Donner wins on voltage spread: it covers 9V, 12V and 18V, so a 12V modulation pedal has a home. It is also lighter at 6.9 oz and sits at a mid-range price position in this set. The MXR wins on warranty and build. Dunlop publishes a clear one-year warranty on defective workmanship and materials, and the unit is US-built per the listing. MXR also states this generation handles twice the power of the original DC Brick, and it dedicates two of its ten outputs to 18V. The cutoff is the 12V pedal. If your board has one, the Donner is the pick. If your board is all 9V and 18V and you want the warranty and the reputation, the MXR earns the extra spend. Weight and footprint go to the Donner either way. ## The verdict The best pedalboard power supply for most guitarists in this set is the **Donner DP-1**. It publishes 10 isolated outputs across 9V, 12V and 18V, weighs 6.9 oz, and takes a universal 100–240V input, which is what a mixed board on a working schedule needs. The one high-current 9V 500mA output covers a modern delay or reverb, and the 12V and 18V slots handle pedals that a 9V-only supply cannot. Two conditions flip the pick. If you want the lightest brick with a stated one-year warranty and a USB port, take the **RVONE RPS-20** at 3.17 oz. If you want a US-built brick with the most complete warranty text in this set and you can live without 12V, take the **MXR DC Brick M237**. The **D'Addario PW-CT-9V** is not competing with the bricks: it is a single-output 9V adapter and the right answer only for a small, all-9V board. The **Mosky** offers the most current-flexible output map on paper, but the listing leaves out weight, dimensions and warranty, which drops it to runner-up. ## FAQ ### How many isolated outputs does the best pedalboard power supply need? How many isolated outputs you need depends on the pedal count on your board plus one spare. For a five-pedal board, six outputs is comfortable. Four of the five picks here publish ten isolated outputs, which covers most gigging boards with room for growth. The exception is the single-output D'Addario PW-CT-9V, which suits small all-9V setups only. ### Is a pedalboard power supply worth it over batteries? A pedalboard power supply is worth it the moment you play a gig you cannot afford to lose to a dead 9V. D'Addario puts it plainly on the PW-CT-9V listing: an AC-DC adapter means you do not worry about dead batteries during a performance. A ten-output brick like the Donner DP-1 extends that logic across every pedal on the board. ### Do I need 12V or 18V outputs on my pedalboard power supply? You need 12V or 18V outputs on your pedalboard power supply only if you own a pedal that asks for them. Some modulation pedals run at 12V. Some overdrives take 18V for extra headroom. The Donner DP-1, RVONE RPS-20 and Mosky publish all three voltages. The MXR DC Brick M237 covers 9V and 18V only, not 12V. ### Donner DP-1 vs RVONE RPS-20: which should I buy? Between the Donner DP-1 and the RVONE RPS-20, the choice comes down to weight and warranty. Both publish 10 isolated outputs across 9V, 12V and 18V. The Donner is heavier at 6.9 oz but breaks out per-output current clearly. The RVONE is lighter at 3.17 oz, adds a USB port, and states a 1-year warranty on the listing. ### What is the biggest mistake buyers make with a pedalboard power supply? The biggest mistake buyers make with a pedalboard power supply is counting outputs and ignoring milliamps. A ten-output brick where every 9V slot is 100mA cannot run a modern digital reverb that pulls 300mA. Check the per-output current on the listing, match your heaviest-drawing pedal to a high-current slot, and only then worry about the total number of outputs. Before you buy anything, list every pedal on your board, note the required voltage and the current draw for each, and add one spare output. Match that list against the output map of the brick. For most players building a mixed board, the Donner DP-1 will cover it, thanks to the combination of three voltages, ten isolated outputs and one high-current 9V slot for a hungry digital pedal. If weight and warranty language matter more than raw voltage spread, the RVONE RPS-20 is the pick. Either way, you will spend less time hunting hum and more time playing. *Last updated: September 7, 2026\. Product availability re-checked.* *This page contains affiliate links. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.*