Leafcutter John shares the steps he took to build a phantom-powered underwater mic from a steel can (looks pretty classy!) -
I decided to house the pre-amp in the same enclosure as piezo elements (to avoid noise entering the circuit). The challenge here is to find a decent enclosure. As the piezo’s and the pre-amp will be underwater they need to be inside something water-tight.The resulting audio samples sound quite good, justifying the gobs hotglue sealer and onboard preamp. Get started building your own over at Leafcutter's site. [via Hack a Day]
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After a few experiments, I found you can quite easily solder steel food cans together using a regular soldering iron and electrical solder. It works for water pipes so It should be water-tight in this case. NOTE: aluminum cans will not work at all well!!! Get out your magnet and find some steel ones!
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