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): M238

For support or warranty questions, please contact the manufacturer:
Phone: 707-745-2722

Reviewers gave this product an overall rating of 5 out of 5 stars. (2 ratings)
Submitted June 27, 2022 by a customer from
"Solid power supply"
Overall: 5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
It powers 8 9 volt pedals not 6 6 ports are 9v 2 are 6v to 15v u can set to 9v there's 8 9volt power supplys plus 2 18 volt you can't lose I've owned one for 2 years works great quiet good price
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