A Future Kit stereo headphone amplifier built into an ordinary deodorant stick bottle. I was worried to turn it up all the way as it could break my headphones; although you couldn’t tell in the video, it really does get THAT loud!
-9V battery
-on/off switch
-stereo input/output
-Volume Control (I used the dial that would normally be turned to push out the deodorant)

This project was done for IEEE in Stony Brook University.

Duration : 0:1:26

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I live in an apartment with two other people. I do a lot of recording and mixing in my room, but mostly through headphones to minimize complaints. I started singing to know, which means there will be some noise. I know you can not completely soundproof my room because it is a house, and can not do anything permanent. . . So the question is, what is cheap / efficient / atleast way to minimize the sound of a voice to what I can do atleast some of the song is decent hour without too many complaints? Thanks for listening, and you can give me an answer that you have to reckon. . . I am open to suggestions!

From wall mate, who plays his music at full volume all day and all night, showing no attention, though my passive and passive displays anxiety. He refuses to use headphones, and refuses to turn his budget proposal to encircle the point that leaks through the walls.
I have a small budget, and is a excellent indicator of the wall we share. I have a large rug, which can reduce each other and stay, but to help curb future votes? I need to know how to reduce the incident sound.
Thanks in advance.