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Type: Posts; User: bob1984

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  1. Replies
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    yes I tried your code, it works ... now the...

    yes I tried your code, it works ... now the signal is really gross (no matter the code)

    I actually try to have a CS5343 working (as master, at first) becos so far when the teensy is the master,...
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    I could manage to have 20Mhz !! but the signal...

    I could manage to have 20Mhz !! but the signal barely comes back to zero even with a pull down


    void setup() {
    pinMode(MCLK,OUTPUT);
    CORE_PIN9_CONFIG = PORT_PCR_MUX(1); // no slew rate...
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    apparently digitalWriteFast does not output...

    apparently digitalWriteFast does not output anything , I get a flat line until I replace it by the usual usual digitalWrite

    I tried with pwm, I barely reach 10Mhz and the signal is more a sine...
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    thx I'll give it a try

    thx I'll give it a try
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    flip flop out put is quiet slow

    Hello,

    I need to generate a +- 22MHZ pulse

    and strangely enough digitalWrite functions are extremely slow compared to the teensy 3.6 working frequency (240Mhz)



    #define MCLK 9
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    I'll check the datasheet indeed, thanks mate

    I'll check the datasheet indeed, thanks mate
  7. Replies
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    I use 9V batteries, I was hoping such power...

    I use 9V batteries, I was hoping such power supply would be quite enough

    the cavity (I already digged and shielded) is not large enough to accomodate the teensy audio board (although I could maybe...
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    thanks Paul, I'll have a look at these...dont...

    thanks Paul, I'll have a look at these...dont care if they go obsolete in a couple of years

    I already soldered msop (0.3mm leads) packages, but it is hard to do without damaging the chip

    I dont...
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    I'll try these ...

    I'll try these

    https://www.befr.ebay.be/itm/CS5343-CZZ-A-D-converter-Channels2-24bit-96ksps-3-1-5-25VDC-TSSOP28/162848000045?hash=item25ea7f482d:g:0FEAAOSwE95aWLQE

    is teensy 3.6 compatible with...
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    did'nt know about that is there any...

    did'nt know about that

    is there any human-solderable I2S stereo ADC out there ?

    I been digging a lot last nigh about this, but they are all zillion-tiny-pins packages so far
  11. Replies
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    my problem is not the resolution, but noise, ...

    my problem is not the resolution, but noise,
    what you say is just discouraging :-) but thanks for the infos
  12. Replies
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    yes but the problem is that I cant solder such...

    yes but the problem is that I cant solder such small smd packages, nor CNC such small traces

    and building it myself pushes me away from my target...

    I thought teensy would be it...appart from...
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    fyi : the compartment is big enough just for the...

    fyi : the compartment is big enough just for the teensy, the power supply will be external (2x 9v battery based + buck boost)

    for the ADC, I was thinking about using this :...
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    that thing is massive, too big to fit in a small...

    that thing is massive, too big to fit in a small compartment that is the size of a teensy 3.6
  15. Replies
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    using a buffer does not help at all, the teensy...

    using a buffer does not help at all, the teensy is just humming as f@#..
    this is so frustrating...

    anyone else knows another board that would be more suitable for audio DSP ?? (preferably with...
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    I been told that jfet were less stable than opamp...

    I been told that jfet were less stable than opamp , besides this opamp is jfet based
    anyway both solutions should reduces the impedance
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    from the doc : "Noise due to high source...

    from the doc :

    "Noise due to high source impedance, which allows rapidly switching digital signals to capacitively couple... avoiding higher analog impedance is the solution."

    how could I do...
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    no noise like this : 18013

    no noise like this :

    18013
  19. Replies
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    I dont understand what you mean, can you mod the...

    I dont understand what you mean, can you mod the image I uploaded ?

    also do I need the 2 GND pins to be connected ? I only soldered a couple of pins, easier to remove that way
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    https://vocaroo.com/i/s0rY0RymFrxr hard to...

    https://vocaroo.com/i/s0rY0RymFrxr

    hard to find an imgur equivalent

    so the first segment is me going through the strings with the teensy bypassed

    then the pickup goes through the teensy and...
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    as I said, bypassing the teensy, the noise is...

    as I said, bypassing the teensy, the noise is completely gone, so the cables are no culprit here

    the noise sounds like high freq hiss mixed with slight aliasing audio artifacts

    I'll try...
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    Teensy 3.6 noise

    Hello,

    I get a lot of noise even with a simple project



    #include <Audio.h>

    AudioInputAnalogStereo adcs1;
    AudioOutputAnalog dac1;
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