Is this hydrophone H2d Hydrophone (aquarianaudio.com) compatible with Audiomoth v 1.2.0?
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,
Oki, I'll try, even though it is very tiny pads...
Anyway, I am so happy that the PCB seems to be OK! :-)
Thanks so much for your swift assistance, Alex!!
Just to confirm, are you connecting the 9V to the battery + & - terminals or the GPIO + & - pads? It should be the battery terminals.
I have soldered them to the now 2x 3AA pack to the battery terminals :-)
Yes. It works very well with the H2d Hydrophone.
Nice, thanks for very fast response!!:-) What about the HTI-99-UHF hydrophone from HTI-99-UHF Hydrophone (hightechincusa.com)? Works as well? Thanks, mats