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  • bob1984's Avatar
    12-02-2019, 03:51 PM
    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, the chip does not...
    7 replies | 112 view(s)
  • bob1984's Avatar
    12-02-2019, 03:45 PM
    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 limit noInterrupts(); ...
    7 replies | 112 view(s)
  • bob1984's Avatar
    12-02-2019, 03:34 PM
    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 than a CLK signal ...
    7 replies | 112 view(s)
  • bob1984's Avatar
    12-02-2019, 06:00 AM
    thx I'll give it a try
    7 replies | 112 view(s)
  • bob1984's Avatar
    12-01-2019, 10:27 PM
    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 byte pulse=0;
    7 replies | 112 view(s)
  • bob1984's Avatar
    10-30-2019, 10:57 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    I'll check the datasheet indeed, thanks mate
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-30-2019, 10:52 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    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 trim it to a...
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-30-2019, 10:48 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    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 even know what is...
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-30-2019, 04:49 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    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 24bits I2S protocol...
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-29-2019, 07:40 AM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    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
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-29-2019, 07:34 AM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    my problem is not the resolution, but noise, what you say is just discouraging :-) but thanks for the infos
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-28-2019, 05:45 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    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 these dodgy ADC, I...
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-28-2019, 05:43 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    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 :...
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-27-2019, 04:40 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    that thing is massive, too big to fit in a small compartment that is the size of a teensy 3.6
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-26-2019, 07:36 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    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 the same footprint ?)
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-26-2019, 07:22 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    I been told that jfet were less stable than opamp , besides this opamp is jfet based anyway both solutions should reduces the impedance
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-26-2019, 10:31 AM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    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 that ? using a preamp...
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-26-2019, 09:48 AM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    no noise like this :
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-25-2019, 05:59 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    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
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-25-2019, 05:40 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    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 into the amp the...
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-25-2019, 05:11 PM
    bob1984 replied to a thread Teensy 3.6 noise in Audio Projects
    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 recording it...but it...
    29 replies | 750 view(s)
  • bob1984's Avatar
    10-24-2019, 09:17 PM
    Hello, I get a lot of noise even with a simple project #include <Audio.h> AudioInputAnalogStereo adcs1; AudioOutputAnalog dac1; AudioConnection patchCord1(adcs1, 0,...
    29 replies | 750 view(s)
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