Product Description


About this Joyo JP04 Isolated Power Supply

Have you ever found the strange noises jumping out of nowhere when using several pedals together? The biggest reason that produces such annoying sound is that pedals are connected in a parallel mode. With such parallel connection each pedal forms a ground loop, which brings the noises from other magnetic field into the signal path and all the other pedals are interfered and become unstable. To solve this problem, all need to do is to get rid of the ground loop and make sure each pedal work in an independent route and most importantly choose a power supply with real independent output free from ground loop troubles.

Well, here is JOYO JP-04 right made for you!

JOYO JP-04 is an isolated power supply available for guitar pedals. It uses a high quality R transformer. It has eight 9V outputs with independent power cable and ground wire, each output is completely isolated, short-circuits and over current protected, highly filtered and regulated, This ensures reliable power, free of hum and noise, just clean and transparent sound.

The Tech Features

Model: JP04

Brand: Joyo

Input: Standard IEC 110-240V

Outputs: Isolated Centre Negative DC 9V:

  • 5x 100mA
  • 2x 250mA
  • 1x 100mA Switchable 12/18V Output

Dimensions: 16 x 9 x 5.5cm

Features: Isolated Short Circuit Protection, Total 10A Current

Included Accessories: DC Cables, Reverse Polarity Cable


Bargain Bin

Reviews (14)

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Great For What I Need

By: on 27 June 2022
The 8 ports are perfect for powering both levels on my NUX Bumble Board. Plenty to fiddle around with, and it'll help me learn a bit about wattage I think. Only grievance, that thing is a massive unit. Thought I'd have some space to put it, ended up strapping it to the board and velcroing my tuner to the top of it. Still, extremely satisfied, and it's always great service!!

Artist Guitars Response
Thanks for your review. If you have any questions, please feel free to reach out, we're always happy to help!

No fuss does what it says

By: on 29 January 2022
No fuss does what it says, provides power to many pedals.

Artist Guitars Response
Thanks for your review! If you need any assistance, we're always happy to help!

Works well, but very tall

By: on 13 December 2021
I have 6 mini effects pedals and the NUX NMP2 Footswitch connected. Even with everything turned on, there is no hum. All power cables are provided, but I had to buy the patch cables separately. With a height of 55mm, the power supply itself is significantly taller than I expected. Not an issue for me, but I doubt it would fit underneath a lot of pedal boards. Overall, exactly what I needed and I'm happy with my purchase

Artist Guitars Response
Thank you so much for this feedback and we really appreciate it with taking the time to let us know.

Love the Joyo JP04

By: on 20 October 2021
Great product works as described. Use it to power up all my pedals. Delivery of the product was faster than expected. Thanks Artist Guitars.

Artist Guitars Response
It is our pleasure and thank you so much for leaving us this feedback. We really appreciate the support!


By: on 5 August 2020
I replaced a BBE Supacharger pedal power supply with this unit: it was half the price and is infinitely better. No hum, clear signal on all outputs. I have varying power needs for numerous effects and there are outputs on this unit to run them all. My rig sounds like a completely new setup. I've only ever had the BBE, which must have been dodgy from the start, and hopefully did not damage any of my gear. Joyo gear has been consistently surprisingly good quality for the price, and I HIGHLY recommend this if you're after a great pedal power source.

Joyo4 power pack

By: on 15 April 2020

Nice isolated power supply at a good price

By: on 27 March 2020
Power supply is working well and not experiencing any noise.

The joy of a joyo

By: on 3 July 2019
I only recently started down the rocky road of pedals... first came the looper and a cheap single adapter but then I got a gt1 to practice more... but the interference and having to alternate between which unit I was using became too much (not to mention the noisy signal interference from the cheap plug)... so I got a joyo power supply 4. Now I can run both pedals together and enjoy not hearing the electrical interference. The only problem is that I now have the capacity for more pedals... hmmm, which one next?

Great unit

By: on 22 May 2019
I've been using this for 18months now, I use this with my board to practice at home and perform at least 2 times a month sometimes more. Never had a problem, even with my EHX pedals that seem to not like non OEM PSU. Only complaint is it's heavier than some comparable units. Other than that, this will serve you well.

Quiet at last

By: on 30 March 2019
Makes pedalboard life much easiier and quieter ! Built like a brick. AC well oiled machine.

Good little unit

By: on 6 August 2018
I got this unit because of the isolated outputs. It is a little bigger in physical size then I thought but ive plenty of room in my pedal board for it. It does what it says it does. Much more professional looking set up then an adaptor and daisy chain setup.


By: on 13 July 2018
This is a really well made product that does what it says. I had the cover off in minutes to see whether it was going to kill me. I design this stuff for a living (military and medical equipment) and I can say it appears to be well designed and constructed. Solid earth in place, and all the mechanical parts fit perfectly. Oh and it also works....

Nice piece of gear

By: on 23 March 2018
Very happy with this product. Powers all my effect pedals and wherever I am I have no more phase issues. Good job!

Good value true isolated power supply

By: on 7 October 2017
The power supply fit perfectly into my Joyo RDB2 pedal board. I've loaded it up using all but the higher powered outlet and even daisy chained a few of the pedals. My pedals are as quiet as if they were running on batteries. The power supply came with plenty of cables and I found it very easy to keep everything neat under my board.