BirdNet Systems Testing #2: a critical review from AI

I'm still troubled by my initial test results

And I haven't made any progress on further testing, 

so I decided to get a second opinion.

BirdNet Systems Testing #1

I thought this would be easy

 Just run BirdNet-Pi alondside BirdNet-Go

Then choose which system to use in the future.

BirdNet-Pi: USB audio module testing

I've bought a couple more modules

so thought I'd do some tests to compare performance.

This post concerns the use of USB audio modules in connection with miniature electret microphone capsules.

BirdNet-Pi: portable operation, mics & bird dogs

Its been an interesting couple of weeks.

I've experimented quite a bit with my BirdNET-Pi system and even built a second system.

BirdNet-Pi: intro, install, use

Which bird species visit our garden?

 

BirdNET-Pi may not fully answer that question.

But it may reveal some unexpected visitors.

Electret Microphone Preamplifier

This design runs from a 5Volt USB supply and attempts to minimise electrical noise.

I wanted to create a simple preamp for an electret mic insert using components from my bits box.

So component values and transistor types are not critical.

Bat Call Logger: the hardware

My bat call logger combines a frequency division bat detector with a Pi based audio recorder.

Recordings are simply triggered by a short stream of pulses from the detector (i.e. "activity").

Having spent a bit of time trying to optimise the hardware, I now need to document what I've done, before I forget why I've done it!

Bat Detector: electret microphones

Building your own Bat Detector is a relatively easy electronics construction project.

The tricky bit can be locating a suitable transducer or microphone that has a useful frequency response into the ultrasonic range used by common bats.

During the last few weeks I have been testing a number of devices, and here are my notes.

Bat Detector Overhaul

About 8 or 9 winters ago, I made a bat detector based upon a circuit published by Chris Eve.

It has never quite lived up to expectations, and has been modified a few times over the years without great effect.

But now its time has come, and I'm looking more closely at ways to improve performance.