Super-sonic listening

One of the circuits I made in my Basic Analog Circuit class was a electret microphone amp that  can have almost infinite gain. It samples itself and regulates the gain based on the input. In a quieter environment the gain can become so high that it is possible to hear things that normally the human ear cannot hear.

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The ITP floor is quite noisy so nothing too out of the ordinary presents itself, though some sounds are much louder than normal: 

The wooden mirror sound really interesting, though the general noise from the busy floor interferes: 

I then went into the stairwell to try to find a quieter place. I had just eaten some almonds and was moving my tongue around in my mouth, and I could hear all the sounds in my mouth! Here is a recording, the mic was no where near my mouth, it sounds sort of crazy: 

I then went into the back stairwell, where there are some interesting oscillations going on: 

 

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