Hi Alex, I've sent you a mail on 2/7. Did you got it? Cheers, David

I tried 3 and all the same result.

Yes, it's correct that the device makes recordings and switches from internal to external but on the ext mic it stays completely silent. Those are the headers from the recordings: Recorded at 02:16:14 01/01/1970 (UTC+2) by AudioMoth 247AA5055F774B30 at medium gain while battery was 3.8V and temperature was 28.5C. Recording stopped due to switch position change. Recorded at 02:16:00 01/01/1970 (UTC+2) by AudioMoth 247AA5055F774B30 using external microphone at medium gain while battery was 3.8V and temperature was 27.7C. Recording stopped due to microphone change.

Hello Alex, I tried this on 'default' mode and when I plug out the external mic I get the same result as in your video. The light stops blinking for a short time and then blinks again. I get two wav.files, one with silence (mic connected) and one with a recording (mic disconnected). But what do I have to see in the header? David

Are there any more options for diagnosis? Or do I have to send in the Audiomoth because obviously something that worked stopped working without any cause. If there is somekind of design flaw it is best that this is solved quickly.

Yes, that's the type I use, with resistor. So on to the next step. Why it worked, and why it doesn't anymore? Is there someone who is using an ext mic without issues?

I checked and my unit does exactly the same as in the video from Alex. Is there another test? "Do both the modified SPM0204UD5 with external circuit and Animal sound Labs ME4-em have the same issue": yes, they both worked before on the AM but now they don't. I tested the mics on another device and no problem there. "Does the AudioMoth external mic work with any other electret condenser microphones you have?": I don't have any so I don't know. " Might need the wiring you used to connect these mics up to the 3.5mm jack to diagnose further." This is the schematic from the SPM (I got it from Edwin).

Hello, same result so something else is wrong and the AM device is probably the cause. But the device works fine with the internal mic. Visually there is nothing wrong on the jack plug connection. Like i said, this audiomoth is barely used and only inside. Is there a way to do somekind of diagnostic check? David

Hello Shawn, I did the test and yes indeed but at higher frequencies between 50 and 55 kHz and independent of the enclosure. Version 1.1.0 (strange enough no issue on 1.0.0!) Gain medium, sample rate 384 kHz. First image : without enclosure, second: only enclosure no membrane, third: enclosure + membrane . Conclusion: it makes almost no difference. Background noise = laptop ventilator.

Hello Peter, yes I followed the procedures with the right bin.file but it seemed it had something to do with administrator rights on the laptop. Windows (10) made some fuzz about putting the bin.file in C (boot drive). But after a few attempts the flash was succesfull. David

Hello, .bin file could not be opnened. Anyone with the same problem? Still in programming mode but what can I do? Just disconnect? Cheers David

Same problem here (app v1.2.2) : local time adjusts only to UTC difference but date stays on 01/01/1970.

Version 1.2.1