Photo courtesy of richfiddler11

May 8th, 2010 – Ok, here’s a seriously cool DIY project for a lazy weekend. User richfiddler11 on Instructables has created a tutorial for making a passive stereo mixer. It has up to four inputs that go to one stereo output. Because it’s passive, it doesn’t require batteries, and you can “mix” the signals together using the volume on the input devices. Super simple concept, elegant execution.

The list of instructions and required materials looks pretty straightforward. I believe you might also be able to plug one input into the output, and have four outputs for emergency sharing. However, the volume would be attenuated because you would normally need an amp to drive four outputs.

Altoids Tin 1/8″ Stereo Mixer via Lifehacker