Sega Nomad: Duo speaker mod *Real stereo*

[Thunderblaze16]

This one took me almost 2 days to pull off, because I had to understand what every pin underneath the jack did, the sound chip itself (315-5684) and where the sound mixing was coming from. Didn't help when I later noticed one of the caps near the headphone jack wasn't completely soldered in, messing with me in finding sound itself. It made things more complicated than needed to be but it at least it helped me see that it was still possible to pull out stereo. The diagram is below.

A quick thanks to the game Eliminate Down for helping me find the correct audio channels.
Using the Staff Roll track, I was able to determine which solder spots were left, right and mix.
https://www.youtube.com/watch?v=HecIdh0PdbA&list=




This is another fun mod so get ready!


Tools Required:

-Long, Phillips head screwdriver
-The Nomad exclusive, 4.5mm security screw removal tool bit
-Round Speaker Diameter 36mm 16Ohm 16R 0.2W ---(8Ohm or 16Ohm are fine to use)
-Rosin Soldering Flux (optional)
-Soldering Iron
-Solder
-2 speakers: 2 original ones or 2 round Speaker Diameter 36mm 16Ohm 16R 0.2W ---(8Ohm or 16Ohm are fine to use)

So first open up the system facing down and remove the screws with their specific tools.
https://i.imgur.com/pibk6HZ.png

Where going to be working with the screen, front side of the Sega Nomad so remove all screws and disconnect all connectors. Remove everything
https://i.imgur.com/Kd7lf0v.png

First we are going to set up our extra speaker, right underneath the 6 button placement.


In this part, you can be creative in how you want sound to pop out, I'll simply be doing 3 small holes.
I'll mark where I want the 3 holes using masking tape.


After some quick drilling, half of the mod is already done. (Notice I drilled off some of the plastic beneath the stand so I could fully place down my extra speaker.)




I'll now place my new speaker and keep it in place with some hot glue dipping.



So the new speaker is ready for soldering. I'll go ahead and desolder the connector of the original left speaker, as we can't get our stereo from the connector it connects to on the board.


Now where ready!




Here's the image, I spent almost a day and half to fully understand the sound that came from the solder spots below the headphone jack.
As you can see, the Nomad originally is connected to a solder spot that pulls both left and right audio into the same speaker. Now you can separate them to the 2 speakers you've placed for real stereo.



Solder your speakers to their proper spots, go ahead and use the same gnd if you want.



The mod is done! BUT there's one more thing.



You won't be able to fully close your Nomad now because of this CAP.


What I simply did was extend it's connection a bit by soldering 2 wires to it instead. (DON'T MAKE THE WIRES TOO LONG OR SOUND WON'T PLAY)


It can now fit in a little empty spot, right beneath the 6 button placement.



Wrap up your Nomad back up and you're done!




For more of my Sega Nomad tutorials, visit the following link below.
http://www.sega-16.com/forum/showthr...014#post767014

[Thunderblaze16]

For those curious, the sound comes from both Pin 31 and Pin 2 of the SEGA 315-5684 chip. Don't know which is left or right or even mix, didn't put more time into it but still figure I share it here.



Rohm / Sega SOUND NETWORK/HEADPHONE AMP
315-5684

[Thunderblaze16]

Bump to show video after mod.

[xelement5x]

Nice clean mod!

[cleeg]

I'd love to have this done, and might just do it when I have the time. Thanks very much for the excellent tutorial.

[Vector]

Damn, that is awesome, thanks for the video and pictures explaining everything too.

[Ichiban Rei]

Done! Thanks so much. The speakers sound a little flat but it’s stereo and much nicer than before.

[Thunderblaze16]

Done! Thanks so much. The speakers sound a little flat but it’s stereo and much nicer than before.

If doing this, I recommend the enhance speakers too. The sound is more loud and crisp compared to the original.


There about $3 a pop.
https://www.ebay.com/itm/1pcs-Round-...AAAOSwc2FZd00m

[Ichiban Rei]

Yea, those are the speakers I used. I actually did the enhanced speaker mod first last week, then I started thinking about the stereo possibilities since I bought a 4-pack of these speakers. Overall the sound is better than the original speaker. There's just a sort of flatness to the sound. I'm probably expecting too much out of these little speakers

[ironnick23]

Do the same instructions apply if also installing a triple bypass mod by mobius strip technologies?

[segasonicfan]

drilling vintage rare sega case...
:''''(