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    Pressure at the center of the Earth?

    My dad threw this one at me a while ago, and I haven't quite been able to wrap my head around the calculus needed to figure it out. Say you have a small hollow sphere at the gravitational center of the earth. Suppose then that tunnels are bored from the surface of the Earth to the sphere...
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    PCM3003 daugherboard volume

    I'm working on a project with a TI 6711DSK board. It's got a daughercard with a PCM3003 codec chip to handle nice 48kHz audio. I'm using it as an effects loop. My problem is that there's about a 30db drop in volume from input to output, and I have no idea how to control the volume output of the...