Build your own audio mixer (mint tin, passive, no voltage) - YouTube
Mixerblocks Is A DIY Modular Analog Mixing Console That's Easy To Make : Ask.Audio
DIY Passive Audio Mixer – SB_
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How does the Sony 6 channel mixer MX-8 work? It has no power supply. There is no phantom power from the items I connect to it yet it works. Besides, I don't