






🎸 Power your tone, silence the noise, own the stage.
The MXR Mini Iso-Brick is a compact, fully isolated power supply delivering five outputs—four at 9V/300mA and one toggleable 9V or 18V/800mA—designed to eliminate ground loop noise and support both analog and digital pedals. Its durable, lightweight build and included splitter cable make it ideal for small to medium pedalboards, ensuring reliable, quiet power for gigging musicians.















| ASIN | B07KPM6QHT |
| Best Sellers Rank | #3,888 in Musical Instruments ( See Top 100 in Musical Instruments ) #40 in Guitar & Bass Pedal Boards & Cases |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,362) |
| Date First Available | November 19, 2018 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 2.47 ounces |
| Item model number | M239 |
| Manufacturer | Jim Dunlop |
| Product Dimensions | 10.79 x 4.88 x 3.5 inches |
A**Z
Favorite power supply
Great power supply for small to medium boards. Value of this is insane and is a great power supply for the average hobbyist .
B**Y
18V output for Eden WTDI
Works Great. Have it powering (4) 9v pedals and using the side output @18v to drive my Eden WTDI amplifier which eliminates a wall wart. Very small and fits under my Voodoo Labs Dingbat Small pedal board. Highly recommend.
B**N
The only way to beat this MXR Mini ISO is to spend 250% more!
For the power that it offers and its size and construction you cannot spend your money any better than this. And if you can find it on sale, even better. Because of the 9 V outlets 350 mA power reserves along with the 18 V having 800 mA of power, you have all the power you need! In my case, I have three 18 V pedals two of which needed 300 mA each, with the other requiring 100 mA. It runs them flawlessly and quietly using a 3 way power cable. That cable, I had to buy separately. It comes with most of the cables you need, including a splitter to run two pedals from a single outlet. Because of the 350 mA of power coming from a single 9 V outlet, you can even daisy chain pedals together from a single outlet as long as you calculate the number of milliamps your pedals need. I only daisy chain my analog pedals. The digital ones I tend to isolate. The only other power supply, I would even consider, is the Cioks DC7. Check it out if you need other voltages. Each power outlet can be configured for four different voltages, and it has tons of reserve power. However, it costs over twice as much as the MXR, but you will not be disappointed.
A**N
Reliable
Amazing product. First purchased mine in 2018. Has been reliable for years 👍
S**R
Awesome Value and Great Ground Loop Noise Reduction!
I've looked at a lot of the popular power supplies on the market like some of the voodoo labs and Truetone 1spot bricks and this one seemed to have the right amount of outputs for the price. I'm surprised that these don't seem to be more popular. I had some noise before I bought this and now everything is quite and absolutely no noise (still a little pickup hum, but my noise gate squashes that completely; no power noise at all). The LEDs are very bright but I guess that is better than not bright enough. I have a Pedaltrain Pro and the cables were long enough that I was able to string my Time Machine nearly all the way to the opposite corner of the board. I was a little concerned about the "sag" outputs but it seems that you can just set them to 9V and they act as a normal 9V output. Also another huge point that I didn't really see anyone talking about on the internet: it seems to power the Digitech Whammy 5 flawlessly. NOTE: this is the version 5 that is 9VDC from the factory (not the AC older versions). So the original Whammy power brick and input say 1300mA, but the Whammy manual says that it consumes <265mA. I think the adapter is a generic Harmon adapter for many things and so they just want you to use what they already make which happens to be 1300mA max. The pedal will only pull the required amperage from the brick at 9V, which again is <265mA and I'm pretty confident that value is accurate, otherwise it wouldn't be in the manual. To be safe I put it on the 450mA output and it works great! Pedals I'm powering: Korg Pitch Black Tuner Digitech Whammy V (DC) Visual Sound Double Trouble Visual Sound Comp 66 MXR Smart Gate Vox Time Machine Switch Doctor generic amp footswitch with 9VDC powered LEDs
G**N
An underrated and overlooked champ.
The M238 and M239 are easily confused with MXRs DC brick, which does not isolate the ports. I have used these isolated port bricks on dozens of boards. The size of the unit, the variety of volts/ milliamps, and the price, make them the perfect choice. If you have a noise problem, it’s one or more of your pedals.
W**M
Space saver
One of the best power supply you can find in the market, size is incredibly small, fits anywhere, no noise, 18 volts is a bonus. Only thing the i didn't like and prevents the 5 stars is the power adapter jack is a bit loose and i had to tape it to the pedalboard cause any simple movement cause the jack to disconnect. Highly recommended if you need a small power supply with high quality.
J**V
only the bottom plugs are easily accessible. As for the top row
I purchased this to use on a Pedaltrain Jr. I know a lot of you want to know if it fits under the board, and it does. However, because of the “T” shape of the rails, only the bottom plugs are easily accessible. As for the top row, there is not enough room to use the straight ends of the plugs. The right angle ends fit; however, to plug them in or unplug them, the unit has to be removed. This might be a deal killer for some, but it shouldn’t be. I actually purchased this unit to put on top of the board because 1) it looks cool, 2) it doesn’t take up much more room than a standard pedal, and 3) I wanted easy access to the variable output controls. I can’t really compared this to other power units. In the past, I’ve always used daisy chains or individual plugs, but in an effort to clean up my gain stage (and my space), I decided I need something that could power a number of pedals with isolated power and 18 volt output options. I chose this one because it had a large number of outputs (10) with a good variety of power options (the two variable outputs were a real selling point). Plus, the price was good compared to other similar power units. As for performance, I’ve used it for almost three weeks and absolutely love it. I have it powering five pedals: Polytune (9 volt 100mA), RC Booster (6-15 volt), OCD (6-15 volt), EHX Pulsar Stereo (9 volt 450mA), RE-20 Space Echo (9 volt 450mA). These all operate noise free and the unit runs cold. Overall, I’m very satisfied and would recommend it to anyone that is not too hung up on mounting it under a Pedaltrain Jr.
K**O
I like it,it works very well.
A**Z
Es pequeña, práctica y funciona muy bien, incluye los cables y tiene adaptadores para diferentes toma corriente
B**X
Cette 'Brick' évite la multiplicité d'alimentations et/ou le recours aux cordons pieuvres. Et fonctionne parfaitement!
B**D
This is a great unit at a good price. This is in fact my third one. I was using two with a substancial pedal board and without thinking, sold them with all of my pedals and started using a multieffects unit. I have since sold my multieffects unit and have gone back to a series of pedals, thus needing the unit again. It is not noisy and works like it should. And the price is right.
K**Y
Ho acquistato l’alimentatore in sostituzione di uno economico e sono spariti tutti i rumori di massa. Davvero ottimo
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