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  • CorBee's Avatar
    Yesterday, 09:47 PM
    CorBee replied to a thread Bat detector in Audio Projects
    Hi, Ive taken the detector out today after adding more shielded cables and several software changes. Here is an image of the "waterfall" spectrumgraph when a common pipistrelle was hunting in our garden. The top of...
    57 replies | 8457 view(s)
  • CorBee's Avatar
    06-22-2018, 04:26 PM
    CorBee replied to a thread Bat detector in Audio Projects
    Hi This thread is revived (after contacting Frank DD4WH) after we had most discussions on the batdetector in another thread https://forum.pjrc.com/threads/52674-A-few-questions-regarding-FFTs-and-performance. Hope...
    57 replies | 8457 view(s)
  • CorBee's Avatar
    06-22-2018, 04:24 PM
    Hi all, I have also contacted Frank (DD4WH) and he agreed on moving the part in this discussion related to building/using a teensy bat-detector over to the allready exisiting thread "Teensy Bat Detector" at...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-22-2018, 08:03 AM
    Hi, I was still "hunting" a best setting to reduce the noise from the board. With F_CPU at 180 and sampling 176k I found using MULT=2 with DIV=8 to be a lot lower/stable in noise. Next up is improving my hardware...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-22-2018, 07:07 AM
    Hi Walter, I am OK with that, but my main aim is to have good cooperation/sharing of ideas/codes problems. If others that are participating currently are also happy with it I will open a new thread or we can migrate...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-22-2018, 05:26 AM
    Hi, Thanks for joining in. I have the feeling that this thread has allready changed a bit from its original main topic. But the starter (@foaly) of this thread can best decide if it can be turned into a wider...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-21-2018, 09:12 PM
    Hi Thanks for that, I have loaded LTSPice some time ago but never got anything working in it ... I always wondered about his latest schematic. I allready have build the scheme in the middle several time. I will...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-21-2018, 08:31 PM
    And here is the schematic with all values corresponding to what I am using now, I will delete the previous schematics Edit: it seems that this forum does not allow to remove/change earlier messages.
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-21-2018, 08:12 PM
    Hi Very well seen, that R7 should not be 100k, I had made this schematic too fast to share ... sorry. Forgot to check the values. I am BTW using 10k instead of 15k for R7 according to the design on the bottom of...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-21-2018, 04:40 PM
    Hi, The I am using the basic for the schematic from #29, but a few things are different. To remove ripple from the powersupply I use a 220 resistor followed by a 100uF cap between VCC/GND. The schematic is...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-21-2018, 01:41 PM
    Just tested using the 1,2 setting at 180M F_CPU to achieve around 176k SR. Unfortunately this had no effect on the noise-level, oddly enough when connecting the micro(I first tested with MIC_GND connected) the signal is...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-21-2018, 01:19 PM
    Hi, My aim is to have a good advanced batdetector. So I will be processing also quite a bit (FFT), I will try the settings you are recommending for F_CPU 180. I guess I only need to change the last entry in the ...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-21-2018, 06:03 AM
    And to further clarify, I am using this code to set the clocks for the samplerate (its by Frank B), if I understand things well this selects 219 for the multiplier and 802 for the divider at a F_PLL of 180M and 192k ??...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-21-2018, 04:38 AM
    Hi Walter, My F_CPU is default, so 180000000 I checked the forum and found this topic https://forum.pjrc.com/threads/48032-Teensy-3-6-overclocked-to-216-240MHz-and-audio-adapter-board-gt-LRCLK-jitter As a newby...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-20-2018, 08:19 PM
    Hi Here is my current setup: -preamp is on the right -on the top is the microphone (connected with a 4 wire shielded cable) -teensy and audioboard on the bottom (blue = GND, red=VIN, yellow is MIC) On the...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-20-2018, 02:52 PM
    @Frank I tried using both the SPU and an electret (PRIMO EM258, seens as a replacement for the panasonic WM61-A) directly on the MIC input of the audioboard. The signal was very weak and the range completely...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-20-2018, 11:59 AM
    Hi Frank, Thanks for sharing pictures of the hardware, ill try to do that also today after I have finalized soldering the preamp. I know its the signal/noise ratio that counts, if that improves you can always make...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-20-2018, 11:17 AM
    Hi Frank, You could use the 5V from VIN (if your board runs on USBpower) to see if that changes the effectivity of the preamp. I have no idea yet how "effective" my transistorbased preamp is. Do you use screened...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-18-2018, 07:07 PM
    Hi Frank Ive tested the setup as you suggested, using 2k2 and 10uF however attenuated the power towards the preamp it looks too much. The signal became rather weak. Ive switched then to 220 ohm and 10uF, tested also...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-18-2018, 09:12 AM
    Hi frank, I hadnt answered your earlier question it seems: "What is your 5 to 6V power supply? Is it clean or a switching PS? If yes, you should filter it extensively or use a different power supply." The 5-6V...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-17-2018, 08:45 PM
    CorBee replied to a thread Bat detector in Audio Projects
    @foaly: nice find !
    57 replies | 8457 view(s)
  • CorBee's Avatar
    06-17-2018, 08:27 PM
    CorBee replied to a thread Bat detector in Audio Projects
    Hi I was trying audacity, cant run Bat explorer properly on linux it looks. I have virtual windows box, will try it on that
    57 replies | 8457 view(s)
  • CorBee's Avatar
    06-17-2018, 08:19 PM
    @frank: Updated my schematic for the transistor preamp using the RC decoupling Cor
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-17-2018, 07:48 PM
    CorBee replied to a thread Bat detector in Audio Projects
    Hi Frank, I had seen that Walter has been working on this, looks as if we are getting closer to a system that really ticks all boxes. I just saw you added a wav-file with pipistrels, but I could not play it (I am on...
    57 replies | 8457 view(s)
  • CorBee's Avatar
    06-17-2018, 07:38 PM
    Thanks for that info. I was allready hopeing it would be a power-decoupling issue. Not clear how you ment the decoupling exactly. Attached is my current setup in the analog detector. The R1/R2 is not needed for the...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-17-2018, 07:21 PM
    HI all, I dont know who is trying the heterodyne setup next to Frank and me. But I found out that using AudioSynthWaveformSineHires instead of AudioSynthWaveformSine for the oscillator seems to give a better signal....
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-17-2018, 07:17 PM
    Hi Frank, Nice from you to chime in ! Can you share how you connected your preamp ? I have tried using the preamp (double transistor amplifier with frequency highpass filtering) I normally use but I am ending up in a...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-17-2018, 07:14 PM
    @foaly: I have a TI stellaris launchpad around that I can program (using arduino) to push out a PWM based frequency. The transducer is a simple monacor 40Khz UST. Thats a device with a best response at 40Khz but you...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-17-2018, 03:58 PM
    Hi Ive also just tried the SPU0410LR5H on my Teensy3.6 (using the batdetector project from Frank DD4WH). Compared to my analog bat-detector which uses an analog preamp the signal was really weak. I have a ultrasonic...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-17-2018, 05:35 AM
    Hi, Do you have an idea what causes these spurious effects in the transfer function ? regards Cor
    6 replies | 148 view(s)
  • CorBee's Avatar
    06-15-2018, 11:23 AM
    Nice work !
    6 replies | 148 view(s)
  • CorBee's Avatar
    06-14-2018, 08:24 PM
    CorBee replied to a thread Bat detector in Audio Projects
    Hi Thanks for that message, that seems a logical explanation as writing to an SD with a high samplerate isnt a trivial procedure. I searched the forum and found for instance this: ...
    57 replies | 8457 view(s)
  • CorBee's Avatar
    06-14-2018, 03:27 PM
    CorBee replied to a thread Bat detector in Audio Projects
    Hello Paul, Thanks for chiming in. The reason I have asked this is that in this particular case the SDcard on the audio shield is not used at all. Frank (DD4WH) has - in his software - specifically choosen to use the...
    57 replies | 8457 view(s)
  • CorBee's Avatar
    06-14-2018, 03:19 PM
    CorBee replied to a thread Bat detector in Audio Projects
    Hi Michael, I understood that, but I was wondering why the SDcard on the AUDIOboard is not used for that purpose. cheers Cor
    57 replies | 8457 view(s)
  • CorBee's Avatar
    06-14-2018, 03:03 PM
    CorBee replied to a thread Bat detector in Audio Projects
    Hi I am waiting for my first Teensy (3.6) to arrive as I am planning to build this project. Ive downloaded your V1.2 sourcecode from GitHub and have been (after adding forward-declarations) able to compile the source...
    57 replies | 8457 view(s)
  • CorBee's Avatar
    06-13-2018, 10:34 AM
    Additionally: I was wondering if anybody thusfar has tried using a preamp-setup to improve the frequencyresponse. In the "hardware" based detectors many people are using the preamp from this design...
    59 replies | 1074 view(s)
  • CorBee's Avatar
    06-12-2018, 09:06 AM
    Hi, I was just searching the net for people using Teensy and trying to hear/record/visualize ultrasonic audio and saw your thread. I am currently still using/working on more standard bat-detector using the analog...
    59 replies | 1074 view(s)
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