Is this hydrophone H2d Hydrophone (aquarianaudio.com) compatible with Audiomoth v 1.2.0?
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Use Audiomoth with an external hydrophone
Use Audiomoth with an external hydrophone
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Hi again, the reason for my earlier question about the H2d hydrophone is that I want to put my AM in an underwater casingwith room for more batteries and connect it to an external hydrophone. This casing has a custom-made ceramic hydrophone which I connected to the input terminals on the AM PCB, via an Aquarian Audio PA-4 preamplifier (powered by a separate 9V battery). I have soldered a bridge between the AM input ground and the jack detect terminal, and inserted a 12kOhm resistor between ground and signal input, as suggested by Jay Barlow in an earlier note. This worked fine when I tested with the internal batteries. I recorded 120kHz “clicks”, similar to harbour porpoise sonar clicks, generated by a fishfinder. Then I went to the next step by replacing the internal batteries with an externa 9V battery cassette (6 AA batteries), connected to the + and – terminal on the AM PCB (the internal batteries were removed). I first tested this setup using the AM live app, with the AM setup as a USB Microphone. This worked fine, also capturing wav on the uSD card. Then I did the final test, trying to record on the uSD card. The AM Firmware Basic was installed without problem, and the AM config seemingly was OK as well. However, when I turned the switch to Default, there was no flashing by the red LED, and there was nothing recorded in the uSD card. I did the External SRAM check, and the green LED flashed both in Default and Custom. When I switched to Default with the uSD card not inserted properly, only the green LED flashed.
What may be wrong, and can it be fixed? Thanks in advance,
mats