Thank you for the detailed response, much appreciated. I think I will wait for the the application note before diving into the re-configuring the firmware. Just tinkered with the Simplicity Studio to see how things would go and was in over my head. So, for a dummy like me I think I will solder some jumpers to C1 to signal a MOSFET to power the external preamplifier for my project. Not as elegant for sure, but hopefully will get the job done. Thanks again!

Thanks for the reply. I am hopeful You could possibly provide some guidance on how to signal the MOSFET to turn on and off with the recording schedule on the audio moth. There is a TX/RX GPIO but I am not quite sure what those pins do. Thanks!

Thomas, you should contact me on my email. I have been working on that same project for a couple of years and have some insight I could share. Halmitchell@gmail.com

Hey Thomas, not sure if they have done any testing with the EM272 or not. The primo mics are hard to source in the US and I found alternatives to the EM172. I have never come across a recording device that has 5 volt plug-in-power (which is the EM272 operating voltage-https://micbooster.com/datasheets/EM272.pdf). Most recorders with plug-in power output around 2-3 volts. That being said I have plugged a EM172 into a plug-in-power recorder and it worked but maybe not to its fullest potential. I prefer this mic element made by PUI Audio which is rated at 3 volts and has the same signal to noise ratio as the EM272 (https://www.puiaudio.com/media/SpecSheet/AOM-5024L-HD-R.pdf). This would also be more in line with the flu-in-power output capabilities. Hope this helps.

I would review the bioacoustics software packages available. Depending on what you are targeting WarbleR, Raven, Arbimon, Vesper are all software packages that may help you.

The note doesn't mention the PIP voltage value. Depending on the voltage supply of the PIP provided from the device, some electrets would work better than others.

I have used conformal coating for other sensitive electronics (night flight call preamp) and it worked well for me (I used both silicon and acrylic [MG Chemicals]). Depending on the case you have it in it may also be a good idea to add a vent so the water vapor can escape instead of condensating.