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  • pe1pwf's Avatar
    08-19-2019, 04:33 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    The resistors are all soldered on the teensy so these are between the teensy and audioboard. I hope this helps. On the last boards I soldered I cut the pins like this so that mounting was easier.
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-18-2019, 08:08 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    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 I also did the same with...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-17-2019, 08:34 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    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 holds the new files....
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-15-2019, 07:46 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    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 again with the SGTL...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-15-2019, 05:08 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    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. There are also...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-14-2019, 09:14 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    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 I also made a few noises....
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-14-2019, 02:17 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    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 differential amplifier...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-09-2019, 04:42 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    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 tried anything with that...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-08-2019, 08:48 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    This is starting to become obsessive.... 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 there is much less 23KHz...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-07-2019, 09:58 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    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 than on the transistor...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-06-2019, 04:42 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    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 can be matched even...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-05-2019, 07:19 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    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 bats come out. ...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-04-2019, 03:37 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Not yet finished on the roof here.... The supports of the solarpanels were sinking into the bitumen. I thought I had a big enough surface but with the very high temperatures the bitumen seems to get quite weak. Now...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-04-2019, 09:26 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Take your time, it looks like it is gonna be a nice day for a ride, well at least here it is. Unfortunately I do have to repair a leaky roof so we have some work to do here. The delay looks about as long as it...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-04-2019, 08:14 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Playback works fine, somehow recording start seems to be delayed by 4 seconds or so. Edwin
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-03-2019, 10:27 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    As it turns out, the single transistor amplifier also is working quite well. If you already buit the transistor amp I guess you don't really need to build the opamp version. There might be a tiny bil less noise in...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    08-03-2019, 07:58 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    I promised some of you to send a message when I was willing to sell the extra experimental boards I have. Since this new board was ment to work better than the transistor amplifier board, I was not quite ready to sell...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-31-2019, 08:10 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Hi Rémis, I think I remember you said adding a capacitor between the 3v3 pins on the audioboard and some pins on the TFT screen helped reducing noise. In the past I tied to reduce noise but most seemed to be data...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-30-2019, 09:31 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    So here we are again, using the opamp amplifier, and ICS microphone in single output mode. I did change the biasing resistor to match the impedance of the microphone, this helped to get rid of the unwanted signal on...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-29-2019, 09:12 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Hi Remis, I do have an oscilloscope. A cheap one but I should be able to see some signals I guess. Although these seem quite tiny and my oscilloscope might not be the best choice. I have no electronics education...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-29-2019, 08:04 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Struggling here with the opamp version board, somehow I seem to have the spurious signal that was described and all of it's harmonics now that I am amplifying with a tl972. ( The one on the right.) It does not realy...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-19-2019, 09:32 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    The images I made are with the ICS-40730 microphone. Please investigate any acoustic issue. I already used a cone with a SPU0410LR5H-QB microphone. I Just put in the ICS in place of the SPU. I did not notice the...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-19-2019, 08:01 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Have a look at these pictures, one with the microphone in the housing behind a 10mm hole, with this setup you can see a big spike near 24Khz. The other picture is with a cone installed. I used to have a short cone...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-18-2019, 10:00 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    I just picked up a Sandisk Ultra 16GB Miceo SD HC I card this afternoon. It seems to work fine. Somehow older SD cards do not seem to work anymore from V0.84 up. Edwin
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-18-2019, 06:44 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    So I found me a cable and even a small SD card. Somehow I can't get the 0.86 version to record. I already found the same problems when i used the precompiled hexes others made. Maybe it is in the old and small SD...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-17-2019, 08:19 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Finally I had the 0.86 version to compile thans to post #316. I donwload the files from the link Remis provided. Removed Arduino by the uninstall feature in windows, also removed the contents from my...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-16-2019, 06:39 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    I understand why differential mode should help reduce common mode noise. I tried to add an image to make me and others help to understand. Can you explain the function of R11 and R12? I think vout connects...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-16-2019, 12:46 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Wow, a lot of activity here. I was quite busy the last weeks so I did not have the time to check the forum. The encodes I used are very cheap chinese encoders EC11 or sometting 10pcs only cost around USD 5. I...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-02-2019, 04:57 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    I just compiled the 0.82 version again, it seems I might have posted a wrong 0.82 version earlier. This is the real 0.82 hex version.
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    07-01-2019, 09:07 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    I thought I might have run over a maf files number but after deleting files I was not able to record or play back any files. The 0.82 version seems to work fine but I did expect the left button function in that one. ...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    06-30-2019, 09:26 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    It seems I have some memoycard issues, files are not recognized and recording starts at B1 but I have files op to B55. I will have to try again tomorrow. It looks like the 0.82 version works fine. 0.84 and 0.86...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    06-30-2019, 08:29 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Hi Cor, I'm just glad to be able to help. The files that I got compiling under windows in Arduino 1.8.7 are saved here just in case anyone needs them. Have you been playing with the playback function? I know you...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    06-30-2019, 05:55 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Compiling finally worked, It does display some warnings but no errors. I went back to Arduino 1.8.7 Teensyduino can be 1.44 or 1.46 I still keep running into time errors so I used my TimeAlt escape to get...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    06-30-2019, 05:43 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Hi Seriesman, I already expected a detailed report of the last few nights... For recording you have to set the function of the left pushbutton to record. Turn the left encoder until you see ButtonL Press the...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    06-27-2019, 09:14 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Getting quite confused here... I tried to completely remove all Arduino stuff, reinstalled Arduino 1.8.9 and Teensyduino 1.46 thought I had all the right libraries and files including the suggested alterations. I...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    06-27-2019, 08:04 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    I did see HAVETM in the latest uSDFS. Used timelib.h like normale and added the #define HAVETM Now I got a new brunch of errors. I thought I already posted that here but it probably failed. I do not have the...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    06-26-2019, 06:40 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Hi WMXZ, I don't quite onderstand what adding the #define HAVETM should do but I tried it anyway. Did you also meen I should remove #inlclude <TimeLib.h> Or remove #define _Time_h from TimeLib.h? I think there...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    06-26-2019, 05:32 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    The FRESULT errors appear when you rename main.cpp so do not rename that file but create a new ino file that is empty. Open that file and be sure the main.cpp and any needed additionele files are in te same folder. ...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    06-25-2019, 05:11 PM
    pe1pwf replied to a thread Bat detector in Audio Projects
    Man, did I fool myself again.... This TimeLib.h issue tricked me for the third time now. TimeLib.h does call for Time.h or time.h but windows does not seem to now the diffence. You (WMXZ) helped us out there before...
    444 replies | 32012 view(s)
  • pe1pwf's Avatar
    06-25-2019, 03:42 AM
    pe1pwf replied to a thread Bat detector in Audio Projects
    I think I know wat caused the problems about FRESULT and similar. I just renamed the cpp to ino. Apperantly that does have a completely different effect as creating an empty ino in the same folder. It still does...
    444 replies | 32012 view(s)
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About pe1pwf

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About pe1pwf
Location:
Netherlands
Interests:
Ham radio / electronics
Occupation:
Mechanical and electrical service tecnician

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Bat detector 08-19-2019 04:33 AM
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