As an update, it looks like I've now got my DIY hydrophone assembled.
I totally changed my plan, rather than build a "stereo" hydrophone, I've si=
mplified the design so that it uses a single 20mm piezo transducer and a si=
ngle 32mm plastic plumbing end cap as the enclosure.
I put two thin foam discs on the rear of the peizo, prior to soldering the =
audio wires to it.
https://groups.yahoo.com/neo/groups/naturerecordists/photos/albums/43381311=
1/lightbox/338617746?orderBy=3Dordinal&sortOrder=3Dasc&photoFilter=3DALL# h=
ttps://groups.yahoo.com/neo/groups/naturerecordists/photos/albums/433813111=
/lightbox/338617746?orderBy=3Dordinal&sortOrder=3Dasc&photoFilter=3DALL#
The end cap was filmed with hot melt - perhaps I should have used a runnie=
r epoxy, as I was concerned the hot melt glue would have melted the audio c=
able - thankfully this seems to not have happened! The hotmelt glue was put=
in so that the outside of the piezo was flush with the open end of the plu=
mbing endcap. I then put a thin layer of epoxy over this to seal it.
The piezo preamp I linked to in my earlier message arrived, so I'm pretty m=
uch ready to go, just need a 3.5mm jack socket to let me hook up the hydrop=
hone to the amp. Will probably a suitably sized boiled sweets tin for the e=
nclosure of the amplifier.
Looking forward to testing this out :-)
Regards, Brian.
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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