How to build an Underwater Bone Earphone

[Christian]

Does anybody know how to build such a bone earphone for underwater useage? I assume it is a "regular" earphone sealed in epoxy?

Regards,

Christian

[UWLocator]

Bone Conduction Earphone

Take a look at patent US3764966 it shows a typical bone conduction earphone.

It is very similar to a regular earphone with the addition of a rubber diaphragm to transmit the sound to the bone. It also has a silicon oil filling the spaces inside to offset the effect that pressure would have on any spaces that are normally filled with air. I have also seen mineral oil used for the same purpose.

[Tinkerer]

Bone counductor

Does anybody know how to build such a bone earphone for underwater useage? I assume it is a "regular" earphone sealed in epoxy?

Regards,

Christian

It looks like an Ikelite connector with an earphone that makes a clicking sound. These are made with sealed solenoids, cast in Epoxy resin.

I still have a batch of about 50 Ikelite connectors and actuators from the time I used to build Underwater PI detectors.
Also have a few housings left over.

Tinkerer

[UWLocator]

When I bought my Superlite helmet, it came with a small speaker and standard microphone. Between the acoustics in the helmet and the noise, it was very hard to understand voices.

I swapped to bone conduction earphones and mic and would never go back. Even with the noise, voices are understandable. Another benefit, we were able to go to full duplex operation so the topside tender was able to use his hands for other purposes and not have to keep pushing a talk button.

I don't use any other earphones in the water anymore.

Rip