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MXR

collapse expand iconDescription

The Mini Iso-Brick Power Supply supplies quiet, noise-free DC power to wide range of pedal types while taking up less space than a candy bar. Whether you need a space-saving solution for your downsized travel board or you just need to power a small, carefully curated selection of tried-and-true staples, this little box has what you need.

First, let’s talk outputs. The Mini Iso-Brick Power Supply has five, and each is fully isolated to eliminate obnoxious, gig-ending ground loop noise. Four of the outputs supply 9 volts of power at 300mA, while a fifth can be set to provide either 9 volts or 18 volts at 800mA depending on your needs. With a generous amount of current on tap and the ability to handle both negative and positive grounds, these outputs will accommodate almost any pedal, analog or digital.

And don’t let the five outputs restrict you—if you need to add an extra pedal, the Mini Iso-Brick Power Supply has you covered. It comes with a splitter cable that can be used to connect two pedals to a single output, provided they require the same voltage and you don’t exceed the output’s current rating. You can do this with all of the outputs simultaneously—just purchase the extra cables to do so.

Finally, troubleshooting can be a hassle on dark stages, so the Mini Iso-Brick Power Supply comes equipped with LEDs to let you know that all your connections are solid. Combine that with a lightweight housing that's built like a tank, and you can step on stage with confidence that your pedalboard will stay powered from gig to gig.
MXR M239 Mini Iso-Brick Isolated Power Supply
MXR M239 Mini Iso-Brick Isolated Power Supply
MXR M239 Mini Iso-Brick Isolated Power Supply

collapse expand iconFeatures

  • Supplies quiet, noise-free DC power to wide range of pedal types
  • Takes up less space than a candy bar
  • Equipped with five fully isolated outputs to eliminate obnoxious, gig-ending ground loop noise
  • Four 9V outputs with one switchable 9V/18V output
  • Handles both negative and positive grounds
  • Enough current to accommodate almost any pedal, analog or digital
  • Includes splitter cable to connect two pedals to a single output
  • LEDs let you know all your connections are solid
  • Lightweight & built like a tank

Featured Articles

collapse expand iconReviews

4.33

12 Reviews

83%

of respondents would recommend this to a friend

Great size but the power cable doesn't stay plugged in
Great size but the power cable doesn't stay plugged in
Great size but the power cable doesn't stay plugged in

Most Liked Positive Review

5

Isolated Power in a tiny package!

This thing is great! I've bought 2, which I use on different pedalboards, but what is cool is you can daisy chain 2 of these together if you want to have more outputs on one board. It's fully isolated, I get no noise. I was originally using just a one-spot daisy chain, which was working great for a while, until I got more pedals and also started mixing digital and analog pedals, had a variety of brands, and sometimes differing voltage and milliamp needs. Let's get down to why this thing is awesome: PROS: 1) It's seriously tiny...like mini TCE pedal tiny...3.5" x 1.5". It fits anywhere, light enough to even be velcro'ed below your board. 2) Fully isolated power, 5 outputs, one output is switchable to 18v too if you want 3) Comes with all the cables you need, and even one splitter cable to do 2 pedals from one output. Out of the box you can do 6 pedals. But you can also add a one-spot daisy chain to one of the outputs, which I did. I have 4 isolated pedals, and then 4 more pedals running daisy chained off of the 9v 800ma output on the end of this thing. Works great, as the 4 daisy chained are the same brand, all digital. 4) Also if you want to put 2 of the mini iso bricks together, you can! Just take the 18v output from one, and put it into the 18v input of the other and BAM, you got more isolated outputs. 5) VALUE. This this is just as inexpensive (or less) than any other truly isolated power supply you'll find. 6) And this is a small thing - but I like the white and green indicator lights on it. So pretty. CONS: 1) It does have a wall wart. This is how they make the actual output box so small. So some of the power conversion and conditioning is happening there at the point of plug in. This differs from the simple IEC power connector that many power supplies have. I actually do not mind the wall wart. It goes in a bag with other cables. I mean, I'd have to throw an IEC cable in a bag too if it was like other pedalboard power supplies...no issue here. That's it!

VS

Most Liked Negative Review

2

Great size but the power cable doesn't stay plugged in

I use this on my tiny board with only three pedals. It fits really well on small boards with only a few pedals. Unfortunately, if you move the board while its plugged in, the power cable will lose its connection. I've tried taping it or securing it, but it still loses connection. This ended up breaking my newest pedal from turning on and off quickly multiple times while just sitting there. I am now trying to warranty this two day old pedal. I don't understand how this is such a highly rated power source. If I move or bump my board it disconnects power and sends a huge popping noise through my amp. Not cool. How can the power supply connection be that delicate?

Filters
Best Uses
  1. Travel3
  2. Having Around The House2
  3. High-End Equipment2
  4. Portable Electronics2
  5. Home Theater1
Cons
  1. Inconsistent Performance2
  2. Short Life1
  3. power cable falls out too easily1
  4. Wall wart1
Describe Yourself
  1. Quality Oriented7
  2. Budget Shopper3
Primary use
  1. Personal12
Pros
  1. Good Value9
  2. Reliable4
  3. Good Power Output3
  4. Long Lasting1
  5. Small enough to velcro onto pedal board1

Reviewed by 12 customers

  • A great small power supply

    5

    submitteda month ago

    byElias

    fromMinneapolis, MN

    Submitted as part of a sweepstakes

    Great power supply, small but powerful with plenty of space for a beginner pedalboard. The build quality is unmatched for the price, and its hard to find any other power supply that has isolated power for less. I recommend it to anyone starting their pedalboard. Also the included cables are great.

  • Very quiet, very small, very affordable

    5

    Verified BuyerVerified Buyer

    submitted9 months ago

    byRoger

    fromSimi Valley, California

    Submitted as part of a sweepstakes

    I have three of these. They are quiet and versatile. Not much added weight to pedalboard. #sweepstakes

  • Delivers Clean Power

    5

    submitteda year ago

    byDroidiphile

    fromSF Bay Area

    I Velcroed this onto the underside of my PedalTrain Nano in the middle back. It fits snugly and securely and does not impinge on cable routing. I think of the quote from the movie Tron, "It's been a long time since I got power from a clean source". Some guys complained that the power feed comes out, so I put an anchor and a cable tie holding the power cable in - mine stays in fine on stage. The wall wart cable is short, but I bought a 6' extender cable, so it reaches my setup from our main power strip with no problems. Some of my pedals will drain a 9V battery in 2 hours, so this box is a fantastic and way better solution than carrying two sets of rechargeables and swapping them out after the 2nd set ...

  • Brick

    5

    Verified BuyerVerified Buyer

    submitteda year ago

    byJosh

    fromPhilly pa

    Submitted as part of a sweepstakes

    Works great came quick, the way she likes it...

  • Great power supply

    5

    Verified BuyerVerified Buyer

    submitteda year ago

    byJason

    fromSan Diego

    Submitted as part of a sweepstakes

    Power supply for effects pedals

  • Great little isolated power supply

    5

    Verified BuyerVerified Buyer

    submitted2 years ago

    byTom

    fromWisconsin

    Submitted as part of a sweepstakes

    Great little power isolated power brick. Lots of power. It has 4 300mA outputs and 1 800mA which powers anything. Pedals like TC Plethora need 600mA. This will handle it. And it comes with a dual cable so you can plug 2 pedals into 1 port. Thing is tiny too. Fits/mounts under my pedal board with ease. #sweepstakes

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collapse expand iconQ&A

Have a question about this product? Our expert Gear Advisers have the answers.

  • submitted4 months ago

    asked byLUCAS

    fromundisclosed

    hey! it comes with the 3 boxes?? incljuding de 18v adapter, cables ? thanks!

    hey! it comes with the 3 boxes?? incljuding de 18v adapter, cables ? thanks!

    Open Reply - Gear-Support
    Physical Inclusions (in the box): 1 x Power Supply Unit (M239 Mini Iso-Brick) 1 x Power Adapter (wall wart) – typically a 9V DC input Power Cables (usually 5 DC cables) to connect to your pedals Velcro or adhesive pads for pedalboard mounting (varies by retailer/package)

  • submitted2 years ago

    asked byBrian

    fromCherry Hill, NJ

    I have two of these for one all power and output LEDS are green, for the other they are all blue, is the Blue LED normal or is the unit defective?

    I have two of these for one all power and output LEDS are green, for the other they are all blue, is the Blue LED normal or is the unit defective?

    Open Reply - Gear-Adviser
    Please give us a call for product troubleshooting 855 77 0 3373

  • submitted4 years ago

    asked byErdem

    fromundisclosed

    Hi, Does this product come with a power supply, or cables??

    Hi, Does this product come with a power supply, or cables??

    Open Reply - Thomas
    Unfortunately, no. Please give us a call to help you find something – 877-687-5403

  • submitted6 years ago

    asked byDaniel

    fromColumus, Ohio

    Does this come with 5 separate cables?

    Does this come with 5 separate cables?

    Open Reply - Kenneth
    This does not come with power cables

  • submitted6 years ago

    asked byMartin

    fromCleveland, OH

    Does this include cable connectors? I see it includes a splitter cable. How about the single cables?

    Does this include cable connectors? I see it includes a splitter cable. How about the single cables?

    Open Reply - Beau
    This power supply does not include any coupler cables. These would need to be purchased separately.