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These resistors are not in the way and do not consume any significant current These conet to the data lines of the micro SD card socket on the audio board. I simply put a resistor in every data line...

I don't expect a lot of activity but it looks like t could be a dry evening. It is quite chilly though.

You could use two small signal diodes in parallel, one from the old circuit and one from...

Man, it becomes hard to keep up here...

When work was done by Cor on the 1.1dev version I decided to work the manual.
It seems a bad idea to work on it because changes are coming very quickly...

Volume 55
Gain 24
TE
Waterfall
Samplerate 176k (better use of display width with most common species)
Recordings 352 (281 should be enough, 384 trends to be a bit more noisy)
Playback 32 (about...

Man so many messages in a short time.

I had to read back more messages that expected to see a bunch of questions from David.

The questions about the signal strength are quite difficult, how...

I also see something about the pressing of the button on the teensy for programming.

Teensy also has a reboot exe, if you look at my google drive there is file called updateXP this contains all...

I had a similar issue. Yesterday I powered op a detector that I left on autorecord the night before. I had almost 700 recordings. Inserting an empty card (OR removing the 700 files card) solved the...

Hi David,

You should hear something if the spectrum shows something or when the waterfall is scrolling.

I normally don't need gain higher as 30 to start seeing some noise if I am near my...

Hi Thierry, this Oktober 5 version is probably the date you are referring to on my google drive, this is the 1.x version with hex filenames. That is indeed the most recent version that is released.
...

Also check for a short on the AF input pins (mic pins in the audioboard)

For some test audio you could use the traingfiles.zip from my google drive.

For audio output test it it quite easy to play a file and hear it in the headphones.

For the headphones you should use a stereo (3 contacts) jackplug and not a 4 pin headset plug.

The...

The forum shows we are already on page 30, but my browser won't open that page. Maybe it will with this new reply.

I did already get some questions about a new revision of the board. I do have to...

Helge, if you look a few pages back you will find post 688 or 687 which has some info on the GPS. I am only using the power (5v) ,GND and txd Line of the GPS module.

The GPS uses a lot of curent...

I just stopped working on improving GPS reception, I seem to have aquired a small fortune of GPS units over the last weeks. And only two out of nine different pcs worked well enough.

I somehow...

I tried several gps units, my test were all indoor under a thin flat roof with thin board and thick polystyrene insulation, old bitumen and layer of EPDM rubber.
Over the Teensy I mounted a small...

Hi Helge,

We know the display uses a lot of current. We have seen the question before to turn off display power completely.
This gives a problem because it can not be turned on. The display...

It looks like the red wire is ouput -
(Datasheet shows top view, terminal side down)

Are you using both outputs into a differential amplifier?
If you are just using one output, the other should...

Hi Blakaddr,, sorry, I was only trying to get people to think, apparently I missed some parts looking over the schematic.

The IRU LDO specifies an output capacitor with a minimum of 10uF, the text...

It looks like you have a nice project going on there, nice video's on youtube....

In the schematic I see failrly low values of capacitors on the outputs of the voltage regulators, specially the...

If you feel you hear digital noise it is not so very much important what voltage regulator you are using. It is more important to run the audio circuitry from a different voltage regulator than the...

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...