3 Simple Ways to
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VideoVideo

Share your how-to video. You'll need your embed code from a video site such as YouTube.

Ghetto Headphone "Amp"

Step 2Cut triangle out

Cut triangle out
Draw/imagine a line going from one corner of the cardboard square to the opposite corner, follow line approx half way across the square (to the middle). Repeat with an adjacent corner to cut 1/4 of the square out. (Pictures make more sense :P)
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Author:geekboxjockey