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  1. Paul, Just a quick heads-up regarding the...

    Paul,
    Just a quick heads-up regarding the missing I2S port 2 issue. Clean installs of Arduino and Teensyduino didn't fix the issue.
    It appears that the problem is being caused by Adafruit's Audio...
  2. Thank you, Paul. That's very helpful. ".......

    Thank you, Paul. That's very helpful.
    ".... procedures for MacOS, Windows, or Linux?"
    Sorry, I should have previously specified. Windows #1 procedure sounds like the best option forward. I won't...
  3. Thank you, Paul for testing a Teensy 4.1 with the...

    Thank you, Paul for testing a Teensy 4.1 with the latest 1.57-beta1 Teensyduino.
    After you had explained that the Teensy will produce those DIN, FS, & BCK signals, regardless of whether the PT8211...
  4. Thank you, Paul. This is a basic Hex audio test...

    Thank you, Paul.
    This is a basic Hex audio test sketch, which was working fine, prior to last night. At the time of failure, I was intermittently (between code edits and downloads) generating...
  5. Yes, this is the modified pin configuration on...

    Yes, this is the modified pin configuration on the PT8211_2 AudioOutput object that I needed to use in order to stack the PT8211 shield with the SGTL5000 quad shields for hex audio. It worked great,...
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    Dmax, Thanks for your feedback. Yes, I came from...

    Dmax,
    Thanks for your feedback. Yes, I came from the days of GS124 open loop scanners and understand the inertial challenges of resonance peaks and the need for precise damping and feed back in...
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    Dmax, This looks like a great start to something...

    Dmax,
    This looks like a great start to something ;-) So, you're using the pixelblaze sensor to digitize ILDA imagery converted to .wav, inputting that into the Teensy, then using this differential...
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    Second attempt to upload schematic: Try, try,...

    Second attempt to upload schematic:
    Try, try, again...

    28139
    Got it. JPG images are displayed. PDFs aren't.😎
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    OMG! Tell me about it! $50K Spectra Physics 165...

    OMG! Tell me about it! $50K Spectra Physics 165 or 172 ion gas monsters to tour with. (Only CoRads did mixed gas during my time.) Uninsurable blown glass tubes inside blown glass water jackets. Must...
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    :rolleyes: Thank you for your interest and...

    :rolleyes:
    Thank you for your interest and advice. Yes, I'm using a modified ILDA conversion amp card w/differential outputs, from PLF HankLoydRight's ESP32 ILDA DAC, w/o the original ESP32 and...
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    Project Update: 6 channel audio on T4

    Hi Folks,
    Just thought I'd share some 'How to's" instead of asking "How do?"
    To summarize in a nutshell, I'm using a T4.1 to develop a polyphonic laser synthesizer, which requires at least 5 DC...
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    Hex Channel SGTL5000 quad + PT8211

    Hello Frank,
    Sorry to burden you with this, but I have a question for you regarding the documentation for the PT8211_1 & PT8211_2 objects within the Audio Design Tool.
    Are these 2 different models...
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    Hex audio w/PT8211 & quad SGTL5000 shields

    Hi Paul,
    Sorry to come back to this, but I still have a question. Having sat down to solder the pt8211 SMT IC onto the T4 breakout board, I see that the difference in documentation is due to the...
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    Thank you for your attention, Paul.;) Yes, I'm...

    Thank you for your attention, Paul.;)

    Yes, I'm preparing to use a T4.1 w/rev D audio shields, one modified for quad.

    "To make this work, just use "i2s_quad" and "pt8211_2", like this:"

    Yes,...
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    Hello Frank, As it happens, the headphone...

    Hello Frank,
    As it happens, the headphone outputs are already DC coupled, but I had to destroy 3 audio shields + 3 T3.6's
    to learn that lesson the hard way. IOW, I've run out of T3.6's and after...
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    PT8211 DIN Pin reassignment

    Hi tly,
    Hope that you are still available, because as it happens, i need to reconfigure the PT8211 to coexist with quad sgtl5000 audio shields. So, I'm hoping to move DIN from pin7 to pin 9. But, I...
  17. TeensySynth 4.1 PCB, Panel, 7 Pots

    Your project sounds very similar to this Teensy Synth project:
    https://github.com/ElectroTechnique/TSynth-Teensy4.1
    You might find the code useful to include within yours. FYI, I purchased the...
  18. Yes, that's precisely why I've chosen rotary...

    Yes, that's precisely why I've chosen rotary encoders for my MIDI controller. But, I've also seen analog synth pots that don't become enabled until their voltage level matches the preset's level ...
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    PROJECT UPDATE: I see some folks have followed...

    PROJECT UPDATE:
    I see some folks have followed this thread, of which has mostly been my novice conversations with some very helpful folks. My primary challenge has been regarding several failed...
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    Great question, Dimitre. I've been working with...

    Great question, Dimitre.
    I've been working with pairs of these audio shields, configured as quad outputs. You can mount them above or below the T3.x, depending upon the rest of your connection...
  21. Hi Achy, Actually, yes, your link was very...

    Hi Achy,
    Actually, yes, your link was very interesting. In fact, I was looking for a circuit to correct for the T3.6 DACs' offsets and to double the signal level. Voila'! there it is!
    27664
    Also,...
  22. Hi Ed, Just wanted circle back to let you know...

    Hi Ed,
    Just wanted circle back to let you know that yes, thanks to your guidance, I got it. Mission accomplished & I'm happy camper, until the next obstacle comes along, as they inevitably do on...
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    Dmax, Except for the non-DC coupling issue, the...

    Dmax,
    Except for the non-DC coupling issue, the T3.x audio shields and the Teensyduino audio library are working very well for me. I'm pushing out 4 pairs of X/Y waveforms, 2 pairs of RGB waveforms,...
  24. Cool! I'm not very brilliant, either. But, in...

    Cool! I'm not very brilliant, either. But, in 1978, I was one of the 2 first laserists to open Laserium at the London Planetarium, then spent the following ten years developing show projection...
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    Cool! Thanks for sharing that schematic, Dmax. I...

    Cool! Thanks for sharing that schematic, Dmax.
    I noticed that the jpg is named 'galvo driver'. Is this not a circuit that connects to the differential inputs of a galvo driver card, rather than the...
  26. Thank you for the guidance, Ed. The code example...

    Thank you for the guidance, Ed. The code example and pointers are exactly what I need to push forward.
    Are you not one of those brilliant minds on this forum?
    I sincerely appreciate your...
  27. Hi Achy, LOL! I tested the quad version of the...

    Hi Achy,
    LOL! I tested the quad version of the MCP4725, the MCP4788. Yes, I2C is too slow for our applications,,, except slow and DC are exactly what I need. So, thanks to Ed's feedback, I'll be...
  28. Ed, I apologize for not understanding what you...

    Ed,
    I apologize for not understanding what you are suggesting. I have no prior experience with altering the I2C bus and am only aware that the addresses can't conflict, unless something like an I2C...
  29. Thank you for the helpful feedback, Ed. Time for...

    Thank you for the helpful feedback, Ed.
    Time for a broader picture to my situation. I need at least 5 DAC outputs for XYRGB signals to control my laser imagery. The T3.6 + quad audio shields + 1...
  30. Are you referring to the T4.x audio shield, with...

    Are you referring to the T4.x audio shield, with stereo DAC line outputs, which receives its audio signals via I2S protocol? That's what I've been using with multiple waveforms being generated by the...
  31. Thank you for that suggestion, Ed. Yes, I've...

    Thank you for that suggestion, Ed. Yes, I've considered that option, but I'm far from being an EE. In fact, last week, I put together my 1st 2 X gain buffer to provide a high impedance output for the...
  32. Yes. That's why the GPIO DACs can only output...

    Yes. That's why the GPIO DACs can only output between 0 and ~ 2 VDC. But, the T3.x audio shields have capacitors on their line outputs, which block DC offsets and center the signal around 0 VDC.
    My...
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    [QUOTE=Dmax;300443]HI TheHermit I'm looking at...

    My only obstacle is the T3.x audio shields not being DC coupled. Been searching everywhere for a solution. Tried shorting across the caps, but seem to have fried 3 audio shields,,, so far. I'm...
  34. Hi, I'm using a T3.6 with quad audio shields and...

    Hi,
    I'm using a T3.6 with quad audio shields and both DAC GPIOs to simultaneously generate 14 sine waveforms, ranging from 100Hz-600Hz. But, my oscilloscope is unable to refresh fast enough and has...
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    Second thoughts

    On the other hand, would the 4 channels of the Adafruit DAC consume four I2C addresses, including 0x60, 0x61, 0x62, and 0x63, and still conflict with the reconfigured SGTL5000's address of 0x62?
    If...
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    Thanks for the info, Frank. Good to know that's...

    Thanks for the info, Frank. Good to know that's an option. However, I've just discovered Adafruit's down and dirty quad audio DAC that is already DC coupled.
    https://www.adafruit.com/product/4470...
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    Thank you, Paul Now that I have 2 T4 audio...

    Thank you, Paul
    Now that I have 2 T4 audio shields, a PT8211, & 3 CS42448 boards on order, plus my existing T3 audio shield I'll have plenty of opportunities to experiment to determine what works....
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    My apologies, Paul. I assumed that your link was...

    My apologies, Paul. I assumed that your link was only to the IC, instead of a finished PCB. Perfect!
    Thank you!
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    Thank you again for your time, Paul. Yes, the...

    Thank you again for your time, Paul. Yes, the CS42448 looks very good as a future PCB candidate, but unfortunately, that's above my knowledge level, at the moment.

    For your convenience, I've...
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    Thank you again for your time, Paul. Yes, the...

    Thank you again for your time, Paul. Yes, the CS42448 looks very good as a future PCB candidate, but unfortunately, that's above my knowledge level, at the moment.

    For your convenience, I've...
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    Thank you again for your time, Paul. Yes, the...

    Thank you again for your time, Paul. Yes, the CS42448 looks very good as a future PCB candidate, but unfortunately, that's above my knowledge level, at the moment.

    For your convenience, I've...
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    Quad audio shield + PT8211 coexistence

    Thank you for the info, Paul, and I'm honored to receive your personal attention.
    Yes, I've already covered most of the info you've pointed me towards, plus searched throughout the forum. Bu, am...
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    Fair enough. I appreciate your honest reply,...

    Fair enough. I appreciate your honest reply, rather than providing baseless assumptions. I appreciate the great resources you've already provided.
    Perhaps someone else will chime in with the answers...
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    CS42448 vs PT8211

    Thanks for the info, Frank.
    That makes the CS42448 even more attractive for a PCB. Yes, it was the prospects of a DIY I2S interface that had me the most concerned.
    Again, sorry to persist, but:...
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    Thanks Frank! It's always very helpful to start...

    Thanks Frank!
    It's always very helpful to start with RTFM.:D
    The only difference with lasers is that the projectors have VCAs that drive either diodes or galvanometers, instead of speaker cones....
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    Hi MarkT, I've searched the forum and haven't...

    Hi MarkT,
    I've searched the forum and haven't found anything regarding 5/6 channel audio for the T4.x. Looks like you're the expert, so here's my question:
    I've just ordered a T4.1, quad audio...
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    Hi, I'm also putting together a multichannel...

    Hi,
    I'm also putting together a multichannel (>15) Teensy 4.1 synth laser controller project and started to use Ableton Live, but noticed that it is limited to only 8 channels. So, I switched to the...
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    DC coupled outputs for lasers

    Thank you for mentioning that issue, MarkT. You're correct that DC offsets are necessary in a show environment with sequences of offset 'beam zaps', different projection areas, sweeping flat scans,...
  49. If this problem wasn't happening when you...

    If this problem wasn't happening when you initially started working with the Teensy, then it's possible that the micro-USB connector on the Teensy has an intermittent connection. I've had it happen...
  50. Thank you for the info. I'm only using PD as a...

    Thank you for the info.
    I'm only using PD as a dev tool, as well. IMHO, analog sliders lose their appeal in the MIDI DAW environment. The pot says one thing and the DAW says something different....
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