I got some copper tape in the mail on Friday, so this evening I made a potentiometer with copper tape and mylar and then I made a paper speaker. The tutorial on Kit of No Parts was helpful but not totally complete. Once I built my first version of the speaker, I realized that there were a lot of things that could improve it, so I built a speaker with a smaller coil. I was going to double it up, but didn’t get around to it. I also realized that the magnets I bought at radio shack weren’t nearly strong enough. So I took apart a dell laptop I found in the junk bin and got magnets out of the hard drive inside. This was a lot better, but I could still get much stronger magnets. I also needed more power so I got a bench power source, but then I burnt out the MOSFET transistor I was using so I had to only use about 3v of power to be safe. I got the paper speaker much louder. Still, it’s hard to imagine it will ever be loud enough to actually hear well for the purposes of the project, so I’ll probably just include headphone in the installation.