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MXR M238 Iso-Brick Power Supply

The MXR Iso-Brick Power Supply is small and light with tons of quiet, noise-free DC power on tap ready to run a wide range of pedal types without crowding or weighing down your pedalboard.


(6 reviews)


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MSRP: Old Price $214.27 Discounted Price $149.99 Save : $64.28 (30%)
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MSRP: Old Price $214.27 Discounted Price $149.99 Save : $64.28 (30%)
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Each of the Iso-Brick Power Supply's 10 outputs is fully isolated, eliminating gig-ending ground loop noise. Whether analog or digital, positive or negative ground, this power box has you covered. The MXR team broke down these 10 outputs to  accommodate a variety of voltage and current requirements: two 9V outputs at 100mA, two 9V outputs at 300mA, two 9V outputs at 450mA, two 18V outputs at 250mA, and two variable outputs adjustable from 6V to 15V at 250mA. The two variable outputs can be used to emulate voltage "sag," a drained battery effect sought by many vintage tonechasers.

On top of all that, the Iso-Brick Power Supply comes in a small, lightweight housing that's built like a tank. Features power on/off and connection status LEDs. Put this little box on your pedalboard to make sure it runs reliably and quietly gig after gig.


  • Pedalboard-friendly size
  • 10 fully-isolated outputs
  • Quiet, noise-free operation
  • Powers a wide range of pedal types—digital and analog, positive and negative ground
  • (2) 9V outputs @ 100mA, (2) 9V @ 300mA, (2) 9V @ 450mA, (2) 18V @ 250mA, and (2) variable outputs adjustable from 6V to 15V @ 250mA
  • Variable outputs can be used to emulate drained battery effect
  • On/off and connection status LEDs

Get your MXR M238 Iso-Brick Power Supply today at the guaranteed lowest price from Sam Ash Direct with our 45-day return and 60-day price protection policy.

Things You Will Get:

  • Power Supply Pedal

Control your voltage


This works great. Having a dial to control the voltage for 2 different pedals gives me the headroom I need for one pedal and the nasty almost 8 bit sound from my fuzz.



Great when in a pinch!


Very nice tidy little power supply! Just what I needed to power the last few pedals on my board!



Sounds great, but change the voltage knob.


I went from the regular DC Brick to this and its night and day. What can I say, but silent. Utility wise, it would be great is the knob to select between volts on 2 of the outputs was harder to rotate. It should click. I concerned that during transport the knobs will rotate and I have to remind myself to check the output voltage every time I set up. Other than that its great, but that's what keeps it from getting a 5th star.



M238 Iso-Brick Power Supply


Satisfied with the product. Arrived within 3 or 4 days from date ordered.



Super clean


I recently added my 8th pedal in my pedal board and that broke the noise barrier for me. I had been using an old boss tuner to power my board but 8 pedals were too many for the daisy chain cable. My pedal board sounded like an idling jet. I went to my local Sam Ash to get a power supply and they recommended the mxr iso brick. I ripped apart my PedalTrain board and put this in the bottom. An hour later I couldn't believe what I was hearing - absolutely nothing. Even w my amp cranked, zero pedal noise. I highly recommend this product.


White Plains, NY


Great Little Supply


MXR has always made great pedals and their DC Brick is no exception. I have used these on many occasions. They are low profile so they will fit pretty much anywhere. its reliable, built well, and has no problem powering any pedal. This is a real hands on product review from [email protected] Sam Ash Indianapolis


Indianapolis, IN


M238 Iso-Brick Power Supply

4.5 6


Series Utility
Model M238
Warranty Info:

The manufacturer's warranty covers parts for one year and labor for one year from date of purchase. The warranty excludes damage from misuse, abuse, and contains other exclusions.