I'd like to use an Audiomoth Dev with an external hydrophone. Most hydrophones with a single-sided pre-amp require at least 3 v power in a 3-wire system (ground, power & signal). However, the 3.5 mm external input jack on this board is designed for a 2-wire plug-in-power pre-amp. I'm testing the Aquarian h2a hydrophone which uses plug-in-power, but it is not as good at low signal levels as the HTI-92-WB hydrophone, which requires 3-wire power. Can anyone tell me if it is possible to modify the existing 3.5mm socket to provide phantom power to a 3-wire system? If not, this would be a good option for future versions of this device.
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@jaybarlow33 Dear Jay, Hope all is well. I recently built a recording unit with the H2A and an Audiomoth 1.2.0 to record fish sounds. I was able to record some fish sounds and would like feedback on the unit I built in terms of sound quality. I can share pictures and audio files with you if that's okay with you. We can also communicate through email or phone. Thank you, Carlos
Thank you Edwin, I will I will give that a try.
Cheers
I would like to attach a JrF (Jes Riley French) 'D' Type Hydrophone (cos I have one !) to one of my AudioMoth recorders via the additional 3.5mm jack socket. I understand from JrF that the hydrophones do not need PIP etc., so theoretically should work. The information here seems to suggests that a resistor might need to be added for the system to work ?
Footnote: The Aquarian H2a hydrophone (which uses plug-in-power - the bias voltage) still works with this 12kOhm resistor. Apparently, a 2.8v bias voltage is sufficient to power it. Also, note that the full-scale voltage given above (0.02 Vrms with low gain) applies to the external input jack on the AudioMoth Dev 1.0.0. Other versions may have different full-scale values.