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    Yes, I ran out of the original batch of 45 and...

    Yes, I ran out of the original batch of 45 and decided to retire the mic modules. The demand was good in the beginning but dropped to about one a month toward the end.
    I figured out that I would...
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    I think I understand your question. Yes, mic...

    I think I understand your question. Yes, mic sounds create an internal voltage that is compared to the voltage on pin 14, TH, or Threshold. When the sound is loud enough, the ACG does reduce the...
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    Yes, I know that I can simultaneous stream two...

    Yes, I know that I can simultaneous stream two ADC channels to USB and they show up as left & right to Audacity - that's how I test the mics. Stereo recording to a file on the SD Card is something I...
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    That's have the fun!! "What can I do with these...

    That's have the fun!! "What can I do with these things?!?"
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    I'd say "Happily, you live in New Zealand!" ...

    I'd say "Happily, you live in New Zealand!" I've never been there but understand that it's beautiful!!

    Tindie wants me to create country-specific profiles in order to add shipping costs to...
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    I hadn't read up on the differential pairs of ADC...

    I hadn't read up on the differential pairs of ADC inputs. Seems interesting. Are you thinking of an conventional microphone input with phantom power and everything?

    I'm probably not going to...
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    Thank you so much!!!

    Thank you so much!!!
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    The signal levels are lower then my set-up - nice...

    The signal levels are lower then my set-up - nice low noise floor! Yes, long wires between the Analog Shield and the microphone element will pick-up noise. On my set-up, the mic element is soldered...
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    I recorded a few seconds of "silence" from each. ...

    I recorded a few seconds of "silence" from each. No 172Hz component. I can't get a truly silent recording given my wife is watching the Emmys in the other room! A touch more 60Hz noise on the I2S...
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    Update: I reran the testing using a little test...

    Update: I reran the testing using a little test speaker and white noise. Actually, it's a small wooden box with the speaker mounted on the outside pointing in and a small hole on the other side. ...
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    I2S mic spectrum 11553 Analog mic spectrum...

    I2S mic spectrum
    11553

    Analog mic spectrum
    11554

    Nope - don't see anything like that.

    Here is the recorder sketch using the I2S microphone:
  12. I'm not sure I understand what that second audio...

    I'm not sure I understand what that second audio input "AudioInputUSB usb1; " is doing. Looking like you're taking audio input from the USB connection and also streaming it back out.
    ...
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    Okay, I created two "recorder" sketches, one...

    Okay, I created two "recorder" sketches, one using the adc1 input connected to the analog mic and one with the I2S mic. This obviously means that I can't simultaneously record from both sources but...
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    Using the recorder sketch seems like a...

    Using the recorder sketch seems like a straightforward way to check. It looks to be mono not stereo so I won't be able to get side-by-side recordings on the left and right channels, but should be...
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    Sound better? I'm not sure I have the equipment...

    Sound better? I'm not sure I have the equipment to judge this based on accurate measurements but here is my setup and results:
    - Teensy 3.2 with Audio board
    - microphone element soldered to the...
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    That is a fine question and one that I can't...

    That is a fine question and one that I can't readily find the answer to! I'm would guess its the same as the Teensy 3.X series given it uses the same Cortex family but maybe Paul or someone that...
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    It should work pretty well, as long as you use...

    It should work pretty well, as long as you use mini-coax cable between the mic element and the amplifier board.
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    For jpk and endless_harmonics (

    For jpk and endless_harmonics (<cool name BTW), I have added the cost for postage to your countries. It's a shame that the postage is more than the mic!!! If you know of less expensive methods of...
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    Changed the sample code to use tft.drawFastVLine...

    Changed the sample code to use tft.drawFastVLine to draw filled boxes - got slightly fast refresh times:


    //****************************************************************************** LCD...
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    Thank for measuring the current draw. I meant to...

    Thank for measuring the current draw. I meant to get around to that!!
  21. If it's the capacitor connected to pin 15, that's...

    If it's the capacitor connected to pin 15, that's filtering the optional volume control analog input. If you're not using that, then you should be good.
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    Glad to hear that it's working fine. I'll go try...

    Glad to hear that it's working fine. I'll go try that speed-up trick with the SPI clock!
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    If I'm lucky enough to get one, first thing I'm...

    If I'm lucky enough to get one, first thing I'm going to do is whistle the "The Bridge on the River Kwai" song into it and have it whistle it back, MIDI style!
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    Switches = cost, which is why I didn't add them. ...

    Switches = cost, which is why I didn't add them. I figure you'll configure it once and use it that way forever, so the switches add no value after the initial setting. It would be possible to wire...
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    Great! Given that I don't test that on every...

    Great! Given that I don't test that on every board, there was a chance that it didn't work. I, like Microsoft, let my customers find the bugs.
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    Wow! That is much faster! Thanks for the tip!!...

    Wow! That is much faster! Thanks for the tip!!

    //***************************************************
    // Spectrum Analyzer using a Teensy 3.2, TJCTM24028-SPI TFT module w/ 9341 driver chip
    // ...
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    Instructions for the Microphone Module - 11275

    Instructions for the Microphone Module - 11275
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    11263 Insert a simple R/C filter on the 5V...

    11263
    Insert a simple R/C filter on the 5V supply to see what happens. I used 100 ohms and 100uF as approximate values but the goal is to turn that 5V supply into a super quiet reference voltage. ...
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    With an amplifier between the Teensy pin and the...

    With an amplifier between the Teensy pin and the speaker, correct?!? I can recommend the Audio Adapter board, using the Line Out pins to an audio amplifier.
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    Agreed - you might be able to do this in one...

    Agreed - you might be able to do this in one stage. The input cap will let you bias the +/- 5V input to 0.6V, with the positive input to the op-amp also biased to 0.6V and then you can scale the...
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    Wicky21 was asking about sample code using a...

    Wicky21 was asking about sample code using a 240x320 LCD with the 9341 driver. Here is my first pass. The rectangle fill method I use seems slow, so I'll be playing with options to speed it up. If...
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    1) Longer cables - I haven't tested with any...

    1) Longer cables - I haven't tested with any longer than 20cm (9") but seems like a good thing to try! I'll use a chunk of shielded headphone cable; shield = GND, Red = 3.3V and White = mic signal. ...
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    By the way, I'll be testing every microphone...

    By the way, I'll be testing every microphone using the test set-up described in this YouTube video:
    https://youtu.be/Vb1vDsfh-GY

    Thanks!

    Leon
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    The first production batch just came in today and...

    The first production batch just came in today and work fine! I'm very impressed with PCBway as a manufacturer - great communication, good component pricing and faster delivery than I was expecting....
  35. I'm going from memory but isn't the gain for a...

    I'm going from memory but isn't the gain for a non-inverting op-amp 1 + Rf / Rin = 1 + 100K / 1.5K = 67.66. Can someone check my math??

    I like that little virtual ground part!! Gotta play with...
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    I'm not sure - that's probably buried in the...

    I'm not sure - that's probably buried in the MK20DX256VLH7 datasheet somewhere. Otherwise, Wikipedia says: Conceptually the Cortex-M4 is a Cortex-M3 plus DSP instructions, and optional...
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    I'm assuming that you're trying to create some...

    I'm assuming that you're trying to create some type of portable analysis system using a Teensy and are keen on making it small, battery powered and need to make decisions based on what sounds you...
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    Boards on order! I'm using PCBway for the first...

    Boards on order! I'm using PCBway for the first time. Costs seem reasonable so now we'll see what their production and shipping times are like. I'll update again when I have some concrete dates.
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    You know that I am!!

    You know that I am!!
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    By the way, I'll be putting them up for sale on...

    By the way, I'll be putting them up for sale on Tindie as soon as I get a batch made. When they're available, I'll post a shameless plug. For sure, in time for the holidays and they'll make a...
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    I would suggest not filtering the mosquito...

    I would suggest not filtering the mosquito buzzing sound until you've capture sufficient audio samples to confirm that you have all the interesting frequencies. Don't trust your ears - sample fast...
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    Sounds good - I just sent you a private message...

    Sounds good - I just sent you a private message via the forum board. You can do the same by clicking on my forum name and selecting private message.
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    Qty Parts Value Description DigiKey Manufacturer...

    Qty Parts Value Description DigiKey Manufacturer
    3 C1, C2, C9 0.1uF CAPACITOR, American symbol 399-1170-1-ND Kemet
    1 C3 100uF POLARIZED CAPACITOR, American symbol 478-8156-1-ND* AVX...
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    The ferrite along with C1 and C3 act as a fairly...

    The ferrite along with C1 and C3 act as a fairly heavy filter for noise coming from the Teensy. Most of the holes are vias to connect the ground plane on the bottom to grounds on the top side to...
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    Adding the schematic to help show the design:...

    Adding the schematic to help show the design:
    11054
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    YouTube video - code

    // Spectrum Analyzer using a Teensy 3.2 & the Adafruit 1.8" TFT module w/ ST7735S chip
    // Test microphone is connected to A3
    // Adding some FastLED code to test interaction
    ...
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    10580 A quick test of the Auto Gain Control...

    10580
    A quick test of the Auto Gain Control circuit. Top waveform has it enabled and the bottom has it defeated by shorting out a level set resistor. Based on popular feedback, I need to add a...
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    Thanks for the tip! I'm going to get an estimate...

    Thanks for the tip! I'm going to get an estimate on what 25, 50 and 100 would cost and go from there.
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    Paul, Thanks! I received a couple of data...

    Paul,
    Thanks! I received a couple of data points that it would be great to be able to disable the auto-gain-control system and a simple jumper will do just that. I'll be spinning the board...
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    Yep - bad soldering job! I confirmed a wonky...

    Yep - bad soldering job! I confirmed a wonky output and discovered a whole pile of solder balls between some pins. Heat it with the heat gun for a few seconds and it's back working again.10169
    ...
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