MXR M238 Iso-Brick Power Supply

Power up to 10 separate effects units via their own isolated outlet. Emulate sought-after sag on 2 outputs with adjustable voltage from 6V to 15V at 250 mA.
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.

Get an overview of the MXR M237 DC Brick Guitar Effects Pedal Power Supply in this video demo:

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
- Two 9V outputs at 100mA
- Two 9V outputs at 300mA
- Two 9V outputs at 450mA
- Two 18V outputs at 250mA
- Two variable outputs adjustable from 6V to 15V at 250mA
WARNING: Cancer and Reproductive Harm -
- Dimensions: (L x W x D) 11 x 5 x 4"
- Weight: 1.23 lbs
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 2 lbs
Shipping Dimensions: 7 x 5 x 4 in
Manufacturer Part Number (MPN): DUN M238
For support or warranty questions, please contact the manufacturer:
Phone: 707-745-2722
(1 ratings)
Submitted July 22, 2020 by Gary Cost in Springfield, OH
"Only 6 ports for 9v output!"
Verified Customer zZounds has verified that this reviewer made a purchase from us.
This pedal power supply is indeed SOLID, well built and reliable. I found only one major disappointment with it. When I ordered it, I 'thought' I was getting a power supply to power a total of 10 of my Boss pedals. Well, beware, if you're running all 9 volt powered pedals, this unit will only allow you to power 6! Not 10! So, after spending all that money I now have to buy another power supply just in order to supply 9 v power to any more pedals! I have no 18 v pedals nor do I plan to purchase one.
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