It looks like a piezo disk microphone. It's easy to build one for a handful of dollars. To make them watertight I use nail varnish instead of the more common plastidip. Be aware you should use an impedance adapter for best results. E.g. Triton, but I have had good results with a BSS DI. Waterinsects in a pond. This os a cheap way to start your journey. But Jules piezo with his adapter will clearly outperform my suggested - cheap- solution.
Hi Johan
Many thanks for your advice.?
I have a modest question. I own a Shadow (12mm). It sounds quite nice. Even on a classical guitars. Would it be possible to turn this pickup into a (small) hydrophone. I'm just wondering.
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Btw: I didn't forgot that you might be interested in a HM-200 (#36096). But sadly I didn't came across another one yet.
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On Fri, Jan 10, 2025 at 08:20 PM, Johan Vandermaelen wrote:
I have built electret hydrophones in the past. They have serious limitations. Noise/sensitivity is one. Another is the huge change in pressure on the (protected) membrane when passing from air to water. It asks for care to release this pressure. Condens is one more concern. In general, except for experimentation I wouldn't advise to use electret for hydrophones.
