TM3030 Humming sound (grounding)

[korg303]

Hello,

I've just finished to build a TM3030, it works great but I don't understand how to ground it, so I have this annoying humming sound.
Can you help me ?

Thanks !

[korg303]

Hello,

Finally got it working, it was because of my mixing table, I use a berhinger HD400 and no humming noise at all.

Let's make some music !