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  1. Thread: Bat detector

    by pe1pwf
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    64,961

    I guess I could also write something about the...

    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...
  2. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Hi Justin, We are gathering samples much...

    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...
  3. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

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

    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...
  4. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    I discovered this issue Cor described when I...

    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...
  5. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Two nights ago I tried an FG element in my...

    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...
  6. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Hi Ivano. I did not read through the LDO...

    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...
  7. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    It is easy to fry your parts with hot air if you...

    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...
  8. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Hi Ivano, thank you for letting us know you are...

    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...
  9. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Did anyone already capture a horseshoe? I do...

    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.
    ...
  10. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    What is that with the display Cor? It looks...

    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...
  11. Thread: Bat detector

    by pe1pwf
    Replies
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    64,961

    It would be nice if something as simply as an...

    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...
  12. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    I guess you should be able to hear discharge...

    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,...
  13. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    As Cor explained we did already try the ADC...

    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...
  14. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Hi Frank, Thank you for your comments, the...

    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...
  15. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    It would be great to have a nice measurement on...

    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...
  16. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

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

    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...
  17. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Why not simply try to mount a Knowles FG-23629...

    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...
  18. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Hi Hendrik, Nice to hear you have something...

    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...
  19. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Looks very nice Zach. If you want to try and...

    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...
  20. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Hi Zip, nice to see you have some ideas. And...

    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...
  21. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Yes I ment the batscanner, You basically...

    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...
  22. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Tony uses the same frequency division detector...

    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...
  23. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    I think this is already quite compact. 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...
  24. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Oh I see, probably France as I see the way you...

    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...
  25. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Hi Manu, I can not see any bad English, just...

    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...
  26. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    A few weeks ago v100 of the code appeard on...

    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...
  27. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Zach, I just packed the board and microphones....

    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...
  28. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    It seems this tread is going into hibernation,...

    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...
  29. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Zach, I have no plans to change to the Teensy 4,...

    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...
  30. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Last evenings of busy bats, bad computers and...

    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...
  31. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Maybe people think we might still be struggling...

    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...
  32. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

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

    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.
    ...
  33. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    aethertech Sorry some parts went missing... I...

    aethertech

    Sorry some parts went missing... I also tried to put the part numbers back where they came from.

    I guess it should look like this...

    17706

    vcc/2 was not used anywhere else
  34. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Well I do hope your 1000 words are all in this...

    Well I do hope your 1000 words are all in this picture....

    Probably missed something.... I don't like the 2k resistors by the way, I have all E12 resistors so 2k2 would have suited me better :-)...
  35. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Hi aethertech, the signal source is a cheap 60mhz...

    Hi aethertech, the signal source is a cheap 60mhz yunec DDS signal generator. JDS6600
    R1 and C2 are not used, C1 and C3 are small velues to help keep all the low frequencies out. I know this is not...
  36. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Thank you for the nice pictures Cor. I hope I...

    Thank you for the nice pictures Cor.

    I hope I can show the effects of VAG setting with a few Audacity screenshots.
    It will show it is hard to know when the system gets saturated because the...
  37. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Compiling again in windows. I just put all the...

    Compiling again in windows.

    I just put all the files I used together in this zip file.

    The text below is also in the zip file..
  38. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Yes I removed C2, it was supposed to "short" RF...

    Yes I removed C2, it was supposed to "short" RF signals to ground.
    Working with the opamp amplifier it just seemed to pick up display update noise so I chose not to place it.

    Also C1 can be...
  39. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    The resistors are all soldered on the teensy so...

    The resistors are all soldered on the teensy so these are between the teensy and audioboard.

    I hope this helps.

    17253


    On the last boards I soldered I cut the pins like this so that...
  40. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Yes I did, somehow it seems I did not post my...

    Yes I did, somehow it seems I did not post my reply yesterday.

    I set the amplification close to 40dB on the TL972, these are the results i got in a quit room with SGTL gain set to 0

    17251

    ...
  41. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    I just updated some documentation. I don't...

    I just updated some documentation.

    I don't quite remember if I shared the link to these files before but any eBay buyer of the V0.2 board als got the link form the item description.
    The link now...
  42. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    The externder was just an idea to be able to cut...

    The externder was just an idea to be able to cut a power supply track and put a separate 3v3 source on the SD card to try and get the writing noise out of the teensy.



    I did some experiments...
  43. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Frank, Maybe you could use a SD-card extender...

    Frank,

    Maybe you could use a SD-card extender like this to be able to seperate the SD powersupply from the Teensy. On the teensy it is very hard to do that but here you can easily cut a track.

    ...
  44. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    In single ended output the -out pad is floating....

    In single ended output the -out pad is floating.

    I do have to mention the codec gain used is quite high,


    This is what I see with codec gain on 10

    17229

    I also made a few noises....
  45. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    Thanks for the 0.94 version Cor. I ill upload...

    Thanks for the 0.94 version Cor.

    I ill upload it to my detectors soon.

    I have been messing with the ICS-40730, I did not like the signal that remained on just about 22-23Khz.


    I tried a...
  46. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    I am still using the SPU0410LR5H-QB, the...

    I am still using the SPU0410LR5H-QB, the ICS-40730 should have a little less noise but it was hard to tell the difference.

    The SPH0641LU4H-1 is the PDM version of the SPU0410LR5H-QB.
    I never...
  47. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    This is starting to become obsessive.... 17152...

    This is starting to become obsessive....

    17152

    Dangerous stuff this kind of hobby.

    I have been out to capture some bat calls and try different cones on my microphone.

    As far as I can tell...
  48. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    I just seem to have lost a lot of noise here........

    I just seem to have lost a lot of noise here.....


    I am using the V0.2 board with opamp amplifier and a SPU microphone on this one.
    I noticed the display update noise could be heared stronger...
  49. Thread: Bat detector

    by pe1pwf
    Replies
    662
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    64,961

    Hi Seriesman, the impedance matching of a...

    Hi Seriesman,

    the impedance matching of a transistor amplifier is quite complicated.
    It looks like this link has some nice information on impedance calculation.
    Maybe the transistor amplifier...
  50. Thread: Bat detector

    by pe1pwf
    Replies
    662
    Views
    64,961

    No problem Cor, I was just thinking out loud....

    No problem Cor,

    I was just thinking out loud. These were the only two functions I would probably use on playback.


    I just uploaded the new hex file to my detectors.
    Will go out later when the...
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