Introduction: Adding an Audio Jack to a MUJI Wall CD Player

Picture of Adding an Audio Jack to a MUJI Wall CD Player

The MUJI wall-mounted cd player is a nice piece of minimalist Japanese design (it got added to the permanent collection of the museum of Modern Art in New York in 2005).

It has one problem though: the internal loudspeakers are of very bad quality and it's not possible to use it with externals speakers because of a missing audio jack. However it's very easy to add one. This instructable will show you how.

Step 1: What You Will Need

  • a female 3.5mm stereo audio jack with switch contacts (normally closed)
  • soldering iron and some wire
  • a mini drill or dremel

Step 2: Open the Cd Player Case

Picture of Open the Cd Player Case

Remove the 4 screws on the back of the cd player. Open the case and remove the on/off switch as well as the power connector. You'll find that the two speakers are connected with a 4 pin plug towards the bottom of the player. The two black cables are ground, red is right channel, white is left channel.

You'll need to desolder/cut the red and white cables from the speaker and additionally one ground cable (on the photo I picked the one connected to the right speaker).

Step 3: Make Space for the Audio Jack

Picture of Make Space for the Audio Jack

I used a dremel to widen the slot so that the 3.5mm jack fits through the slot. You probably have to experiment, or you could just use a drill with an appropriate bit. A 2.5mm jack might fit without drilling, but I haven't tried that.

Step 4: Solder the Cables and Fit the Jack

Picture of Solder the Cables and Fit the Jack

Solder the wires you removed from the loudspeakers to the audio jack. There're usually 5 pins on it: 1x ground, 2x left channel and 2x right channel. Make sure you solder the cables to the pin which is connected to an inserted plug (test it with a 3.5mm solderable plug and make sure you get the polarities (L/R) right). The 2 other pins need to be soldered back to the speakers and will only be active when no plug in inserted (= normally closed). Solder the black cable from step 2 to the ground pin on the jack, and another back to the speaker's ground.

Step 5: That's It!

Before closing the case make sure that the audio jack is sitting nicely in the slot and that everything works. Dont forget to reconnect the on/off switch as well as the power plug. It should work like a normal laptop audio jack: an inserted plug turns the loudspeakers off.


lioncour (author)2017-06-08

AWESOME, and thnx :D

feglinton (author)2016-02-03

OMG thanks so much for this instructable, today I realised that it looked so good on my wall but havent used it for ... 3 years... so I thought "I really hope someone turned into something more usefull" and Haza! googled your instructable. I'll put my hands to work!

evgiller (author)2009-10-04

could you do this same sort of proccess with an audio left and right RCA plug so i can have it connect to my amp?

jberkel (author)evgiller2009-10-05

sure, or you could just use a 3.5mm -> RCA adaptor. I prefer the jack plug solution because it's small & not very intrusive.

jberkel (author)2009-06-17

note: you probably don't need to cut the ground cable. it should be enough to connect a wire from ground to the audio jack's ground pin in step 4

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