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  1. Replies
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    Hi Frank, Thanks for the additional info, for...

    Hi Frank,

    Thanks for the additional info, for me this is currently too difficult to assemble. I have never worked with SMD parts but its good to have this recorded for those that read this later...
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    Just found the the schematic (using a different...

    Just found the the schematic (using a different Opamp) here https://github.com/m-r-s/hearingaid-prototype/wiki/Pre-amplifier
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    Hi all, I have also contacted Frank (DD4WH)...

    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...
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    Hi, I was still "hunting" a best setting to...

    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...
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    Hi Walter, I am OK with that, but my main aim...

    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...
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    Hi, Thanks for joining in. I have the feeling...

    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...
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    Hi Thanks for that, I have loaded LTSPice some...

    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...
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    And here is the schematic with all values...

    And here is the schematic with all values corresponding to what I am using now, I will delete the previous schematics

    14057

    Edit: it seems that this forum does not allow to remove/change...
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    Hi Very well seen, that R7 should not be...

    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...
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    Hi, The I am using the basic for the schematic...

    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...
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    Just tested using the 1,2 setting at 180M F_CPU...

    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...
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    Hi, My aim is to have a good advanced...

    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...
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    And to further clarify, I am using this code to...

    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...
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    Hi Walter, My F_CPU is default, so 180000000 ...

    Hi Walter,

    My F_CPU is default, so 180000000

    I checked the forum and found this topic...
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    Hi Here is my current setup: -preamp is on...

    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...
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    @Frank I tried using both the SPU and an...

    @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...
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    Hi Frank, Thanks for sharing pictures of the...

    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...
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    Hi Frank, You could use the 5V from VIN (if...

    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...
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    Hi Frank Ive tested the setup as you...

    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...
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    Hi frank, I hadnt answered your earlier...

    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...
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    @frank: 14038 Updated my schematic for the...

    @frank: 14038

    Updated my schematic for the transistor preamp using the RC decoupling

    Cor
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    Thanks for that info. I was allready hopeing it...

    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...
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    HI all, I dont know who is trying the...

    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...
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    Hi Frank, Nice from you to chime in ! Can you...

    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...
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    @foaly: I have a TI stellaris launchpad around...

    @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 ...
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    Hi Ive also just tried the SPU0410LR5H on my...

    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....
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    Additionally: I was wondering if anybody thusfar...

    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...
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    Hi, I was just searching the net for people...

    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...
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