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I just used a small bluetooth audio transmitter/receiver bought for a few bucks on aliexpress. It uses an usb connector for powersupply and has two audio jacks. One is for the RX and one for the TX...

I don't know why I have the Z version in the parts list. Probably because the CAD program lists that one an not the 3, 3.3 and 5V versions but the Z as generic. If I have to work on the manual I will...

Hi David,

You are too late, the bats just woke up last evening... well at least here they did, I heard some pipistrelle, serotinte and plecauri but I guess that is just because of the warm...

Whoops, I accidentally took out the wrong connections to the audioboard. I don't know how I managed to do that, but this should be the right schematic.

23620

As promised a few pictures....

Notice the ferrtite bead on the wires of the GPS module this to help keep the RFI out. I also use a switch in the GPS powerline. The GPS unit draws quite a bit of...

The GPS turned out to be quite a struggle. The code running in the Teensy and all the data lines being switched make a lot of noise. The GPS unit is very close to the busy Teensy and has problems...

These are nice values to start with.
It kind off depends on the current drawn, and the space that is available.

If too much voltage drops over the resistor lower the value and of possible...

These step-up modules generally are noisemakers.
It is always a good idea to consider and extra capacitor. I do like to use RC filters so a few ohms resistor followed with a big capacitor, that...

I guess I would start by disconnecting 3v3 of the teensy to the audioboard bit power the audioboard from a separate 3v3 regulator.

The audioboard is designed to connect directly to the teensy, but...

It looks like you have a CR2032 battery on the 3v3 circuit? It guess you actually want to have that on the Vbat pin.

Or is this ment to be a big capacitor? I know upon writing on these sd cards...

Thank you for your replies, materials like fx5 are new to me I will look into that.

My detector is portable only about 3x5x1.5 inches the Teensy is just about in the middle and the display is...

Thanks Paul, I have a resistor in every dataline (150 ohms). The TeensyBat detector already needed them to keep the the noise out of the bat sound recordings.

I'm afraid an external antenne in the...

I tried several power sources, and planned it to be running from the "powerbank" that also powers the Teensy via a small RC filter. It already proved to be hard to keep all the data signals and...

Hi there,

I am using a Teensy 3.6 audio project using the audioboard getting samples on a high rate and a displaying waterfall or spectrum on an Ili9341 3.2" display. (Teensy bat detector...

I would not expect the audioboard to get into trouble when you make a short on the teensy board.

Did you lose microphone audio, or headphone (playback) or both?
If the teensy does not "talk" to...

Hi Jim,

Sorry to hear you damaged something.
What is still working, and what is not working right now?


There is a small fuse on the teensy, so if that blew you might be able to fix it.
...

I did simply connect one of the chinch output connectors (GND and signal lines) to the audio input lines of the TDA2030 amplifier board. And ofource the output of the amplifier to the ribbon tweeter....

Hi Justin.

would you be so kind to share the code that you use to create the GUANO standard metadata?
I might be nice for other user to have.

For the hardware part also found something...

I guess I could also write something about the filenames and recording duration.

We ran into an issue using autorecord. Upon creating a new autorecord file we there was a check for the next...

Hi Justin,

We are gathering samples much faster that the SGTL chip was intended for but it works. I guess the code describes who found the way to take quicker samples or maybe Cor can reply on...

Hi Ivano, Are you still reading this tread? I guess so.

I have been playing around with your schematic, it actually looks like something I tried before. And I mean the active filtering in te...

I discovered this issue Cor described when I wanted to have some recordings comparing the FG element I recently bought and the SPU element that I have been using up to this point.

Some times the...

Two nights ago I tried an FG element in my detector and found is was much weaker than the SPU element, maybe almost like 20 dB lower in my test recording. So I changed some parts in the amplifier and...

Hi Ivano.

I did not read through the LDO datasheet but usually capacitors on the output side of the LDO are larger. Are you sure 100nF is sufficient?
Why the 2v5 regulator and not a voltage...

It is easy to fry your parts with hot air if you are not used solder like that. I always soldered SMD with my old Weller magnastat that I always used with standard(B7?) tip. People think that is huge...

Hi Ivano, thank you for letting us know you are working on this. I had no idea it would make much difference to use the inverting or non inverting input of the amplifier. I guess I skipped that part...

Did anyone already capture a horseshoe?

I do not have them around here so I played some recording.
I you have a good recording of rhinolophus hipposideros (lesser horseshoe) I'd like a copy.
...

What is that with the display Cor?

It looks much different compared to the v1.0 software...


Well I know of course, and in case you guys did not notice how good the serotine looked in Cor's...

It would be nice if something as simply as an oriental frying pan or lid could work, unfortunately the higher te pitch the shorter the wavelength and the lager the chance that the sounds are...

I guess you should be able to hear discharge sounds, MFJ is selling the 5008 as device to detect ultrasonic discharge sounds with a parabolic dish.

MFJ is normally producing HAM radio equipment,...

As Cor explained we did already try the ADC input, also the line-in of the audio board was tested already.

Line in was not better than mic in and line in ment we did not have the full advantage of...

Hi Frank,

Thank you for your comments, the "hole" in the sensitivity of the ICS microphone does indeed not really seem to affect the termination of bat species, there is not a huge difference...

It would be great to have a nice measurement on the unit Ivano. Parts are posted and I understand Ivano alo has other projects unfinished. I just hope that your curiosity will make you build this...

Thank you for releasing the final 1.0 version of the software Cor.


I am compiling in Arduino on a windows machine, on my Google drive you will find a complete windows package of the final...

Why not simply try to mount a Knowles FG-23629 element in stead of the MEMS element.

It seems available form Mouser and Digikey, the element is much more expensive than the Mems elements but they...

Hi Hendrik,

Nice to hear you have something working now.
The detector has improved a lot since the veroboard versions.

Not just in hardware but also in software. It amazes me what the...

Looks very nice Zach.

If you want to try and get rid of the 23khz noise, it might be a good try to use an other microphone. In the pictures I see you use the ICS microphone which seems to have a...

Hi Zip, nice to see you have some ideas.

And thanks for the pictures of your nice work.

The 23khz is a known issue and seems hard to beat so I hope you have an easy way to improve that. Maybe...

Yes I ment the batscanner,


You basically have two options if you want to build something simple.

Frequency division, this does not require any tuning, it works by amplifying the received...

Tony uses the same frequency division detector concept in Manu of his designs. A double lm386 as amplifier for the UST and a 4024 IC as devider.

I have been unwanted oscillations in the...

I think this is already quite compact.

The enclosure is quite thick (36mm) but if you want a display and some controls you will probably get something like this size. The 68mm width is perfect for...

Oh I see, probably France as I see the way you are writing the names, but quite close to the border of Germany I think. Anyway I think your English writing is fine.

If you want to have a more than...

Hi Manu,

I can not see any bad English, just looks fine.

Where are you form?


The PCB and mic on ebay is the latest version, I do not know if anyone crated a 3d print file for a box. maybe...

A few weeks ago v100 of the code appeard on CorBee's Github.

There is a nice feature added, "Autorecord"
This function starts a recording for a defined time followed by A defined pause after a...

Zach,

I just packed the board and microphones. Expect a small refund because of the combined shipping.

The soldering can be tricky, I have seen people soldering by clamping the microphone with...

It seems this tread is going into hibernation, just like the bats.

I don't seem to be ready for hibernation, found a bat sound that I could not quite place and wondered how "flat" the response of...

Zach, I have no plans to change to the Teensy 4, the layout is different and also the sd card socket is not on the teensy 4 although it seems people started building extension boards which do make...

Last evenings of busy bats, bad computers and struggling with Kicad.


I think this sums up most of the activity here.
My computer stared acting up telling me not to shut down but configuring...

Maybe people think we might still be struggling to get the device working properly. This is not the case, we are just looking to get it to work even better than it already does.

The next path was...

Well, here we are again finally a bit of hobby time.

Unfortunately it is wet and cold so no bats to play with and for testing we only have our digital pet-bat in a noisy in house environment.
...