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⚡ Power your pedalboard like a pro — compact, clean, and unstoppable.
The MXR Mini Iso-Brick is a compact, fully isolated power supply designed for guitar effects pedals. It features five outputs—four 9V outputs delivering 300mA each, plus one toggleable 9V/18V output with 800mA—providing versatile power for analog and digital pedals alike. Its included splitter cable allows daisy-chaining pedals on a single output, while LED indicators and a rugged stainless steel enclosure ensure reliable, noise-free performance for professional gigging musicians.















| ASIN | B07KPM6QHT |
| Amperage | 300 Milliamps |
| Best Sellers Rank | #4,751 in Musical Instruments ( See Top 100 in Musical Instruments ) #39 in Guitar & Bass Pedal Boards & Cases |
| Brand | MXR |
| Color | black |
| Connector Type Used on Cable | 20+4 Pin ATX |
| Customer Reviews | 4.5 4.5 out of 5 stars (405) |
| Enclosure Material | Stainless Steel |
| Form Factor | compact |
| Input Voltage | 18 Volts (DC) |
| Item Dimensions | 10.79 x 4.88 x 3.5 inches |
| Item Type Name | Power Supply |
| Item Weight | 70 Grams |
| Manufacturer | Jim Dunlop |
| Mfr Part Number | M239 |
| Model Number | M239 |
| Output Current | 800 Amps |
| Output Wattage | 14.4 Watts |
| Specification Met | FCC |
| UPC | 710137108165 |
| Warranty Description | Dunlop manufacturing, inc. Will repair or replace, at its discretion, defective workmanship or materials on all new dunlop electronics directly or through the selling dealer or authorized service technician, for one year from the date of purchase, at no cost to the original purchaser. Repair or replacement parts installed will then be warrantied for the unexpired portion of the original warranty t… |
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.
H**N
Quality and Clean
Build quality is amazing as always. Design is clean and functional. The 18v power supply is pretty chunky in size so be prepared to make room for it. Great product overall.
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.
D**H
Light weight, well made, great brand
Plenty of power and you can daisy chain another one into the 18v slot if you need more slots. Super compact and fits under my board with ease. I am a big fan of Dunlop/MXR stuff; it’s durable and dependable. I’d say they are a working musicians dream. There are cheaper options but there isn’t a thing I trust more in this price range.
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.
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.
R**L
Great power supply
This power supply is perfect for my acoustic pedal board. All of the cables are included plus 1 extra “Y” cable to run from the power supply to 2 pedals. I use all 5 of the outputs and have no issues. It is quiet, tiny, and does not affect the sound of my guitar.
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 .
M**E
Cabe en mi pedalboard es muy compacto no mete nada de ruido excelente producto
W**M
This is one of the best power supply I ever had, I already got 4 of these powering my multiple rigs, recently I made a new pedalboard and definitely was my first choice. It supplies 100% isolated power through its ports, very quiet, zero noise, reasonable price, small in size so it takes no space if placed on top of the pedalboard neither if below it. Also does not require any special tools or accessories to hang it below the pedalboard, I added a velcro and it hangs there for ages. Only down fall is the power supply jack gets easily disconnected from the unit with any movement. I solved this with a zip tie, I tied the adapter wire with a zip tie to the pedalboard thus it doesn't get affected if any movement.
T**N
Small size means it fits under pedalboard easily. Works really well and very easy to set up. Switches off automatically after a while too. Highly recommend if you use pedals regularly.
D**Y
Low noise and so small! Greta quality! No issues! :)))
C**N
El producto llego dañado. Una de las entradas no funcionaba y no me percaté de ello hasta diciembre. Sin embargo Amazon ha procedido a devolverme el importe sin tener en cuenta que han transcurrido 4 meses.
Trustpilot
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