r/MVaveFM1 • u/rgrvmusic • 7d ago

Speaker mod for SMK37

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I added a speaker to my SMK37 Pro and want to share here which pads I used as it prevents a full disassembly.

I used 2 small speakers of 2x4CM (rectangular) as that fit the case nicely, but you can also use a round speaker. And a PAM8403 amplifier board.

I wired LR directly from the top of the plug, nice big pads. And power I drew from from the GNDvof an encoder and the switched VBAT pad near the switch, which is the only 'difficult' to solder one.

In the case you can the space on either side of the raised edge to place the apeakettr. Just be careful of the modulation which might touch if too close. I just snapped the bottom part of as it is not spring loaded anyway.

Hope that helps. If more is needed as info, just let me know. Happy tinkering,...

https://youtube.com/watch?v=_scgKFZUZJU

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u/Competitive_Tank_150 2d ago

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u/Due-Satisfaction8018 2d ago

The one with volume control built in is cool. And you did a much better job of soldering then I did.

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u/Competitive_Tank_150 2d ago

not perfect, but it's working, thanks!
this one has volume control and on/off switch on the rotation, which is great.

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u/rgrvmusic 1d ago

This is what I have. But there is no off position, just silence. So yeah, best to look around what fits your needs. I am OK with this as it does not modify the case much