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    @firehopper, @dkryder - Thank you so much - ...

    @firehopper, @dkryder - Thank you so much - that worked. I didn't even remove the Teensy from the breakout, just held down program button as suggested, and it came back to life :D I didn't know...
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    Help!!!

    I seem to have bricked my T4 by simply pressing the mini-tactile power on/off switch!!! I simply tried it as part of the debugging of the breakout, and the T4 turned off after the five seconds but...
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    Where can I find KurtE's pintest? I looked on...

    Where can I find KurtE's pintest? I looked on GitHub.
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    I have never known excess flux on boards to...

    I have never known excess flux on boards to create device function problems. For short-term prototyping projects I often don't bother to clean it up at all. But it sure makes the boards look...
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    Follow-on from above: If you want to take an...

    Follow-on from above: If you want to take an arbitrary waveform, say an existing sinusoid, and alter its phase by 90 or 270 deg, I can let you have a "good" Hilbert transformer audio block. It...
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    I always use rubbing alcohol with a good...

    I always use rubbing alcohol with a good scrubbing with a toothbrush (preferably not your current one) and then mop up carefully with a paper towel to absorb the residue.
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    @loglow I measured it again and guess what -...

    @loglow

    I measured it again and guess what - it is now 2.93 volts. Sorry about that - I'm embarrassed.



    I have two more T4's arriving from PJRC tomorrow. They both will ultimately end...
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    Try the following direct IQ generator Audio...

    Try the following direct IQ generator Audio block, I think it does what you want. I've used it in my SDR work for a couple of years.
    Bonus: It works on the Teensy 4.0 with the Audio card :D

    ...
  9. Thanks for the nice comments, Tom. I played...

    Thanks for the nice comments, Tom.

    I played with the Soft-Rock kits a few years ago, and as I recall they had a SI570 chip on board, and I'm trying to recall how it was tuned??? Maybe it was...
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    @mjs513 - I had the same problem but noticed it...

    @mjs513 - I had the same problem but noticed it early enough to move the connector away - and that's when the spacing between the SD socket and the connector became impossibly tight.

    On the same...
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    What is the function of the mini tactile switch? ...

    What is the function of the mini tactile switch? I thought it was a reset/reboot?? It certainly pulls its signal low when pressed - but I can't see that it does anything. I tried


    void...
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    Well, it blinketh most brightfully. BUT a couple...

    Well, it blinketh most brightfully. BUT a couple of fails as well.

    1) There is no way you can put a battery in the holder once everything is assembled and the long side headers are installed. so I...
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    @KurtE The chip is in a very small black plastic...

    @KurtE
    The chip is in a very small black plastic carrier that looks very similar to the black 0.1" jumper. I at first confused it for a jumper...
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    Assembly is complete, but I haven't yet powered...

    Assembly is complete, but I haven't yet powered it up. The following are my comments on the kit, and how to assemble it:

    1) This is definitely NOT a kit for the inexperienced. I have many years...
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    @firehopper Wow! You sure have good vision...

    @firehopper


    Wow! You sure have good vision - thanks! Even when I magnify the image I can just make out might be the blurriest of the letters SII. But yes, the bar is in the right place, so...
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    Re #95. So here's what I've gleaned so far, I...

    Re #95. So here's what I've gleaned so far, I believe that the ambiguous marking is "SII" which was recently bought-out by ABLIC. I've looked through their product line, but I haven't find a chip...
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    How do I tell the orientation of the TPD3S014...

    How do I tell the orientation of the TPD3S014 chip (ie pin 1)? I have examined the package under a jeweler's loupe and I can not see any evidence of a dot or a notch on the package anywhere. I can...
  18. Just to keep the thread on topic, here a couple...

    Just to keep the thread on topic, here a couple of photos of the construction of the AudioSDR BareBonesWSPR T4 construction:
    17483
    and bottom view
    17484
    the right hand board holds the QRP Labs...
  19. Hi guys, You ask some great questions! I'd love...

    Hi guys, You ask some great questions! I'd love to keep discussing these, but I just don't know what the best forum would be. Is the Teensy forum the appropriate place - because these are broader...
  20. Thanks Jim, I spent a lot of time working...

    Thanks Jim,
    I spent a lot of time working looping at frequency domain processing and FFT convolution for use in SDR, but ended up asking myself: why am I doing this? It's interesting - I spent...
  21. AudioSDR is fully fuctional with Teensy 4.0!

    I have just finished wiring a new board to allow the T4 + Audio Board to work with the QRP Labs Receiver Module. I nearly fell off my chair when I compiled the BareBones WSPR receiver (that's...
  22. I uploaded some small mods to GitHub and called...

    I uploaded some small mods to GitHub and called it Ver, 1.01. There are no functional differences:
    1: Removed the #include "Streaming.h" from AudioSDR.h (which was a hangover from debugging)....
  23. Hi Frank, Super to hear from you. I'll be...

    Hi Frank,
    Super to hear from you. I'll be really, really interested to hear what you think. Please let me know of any problems, criticisms etc (I'll PM my email to you). Nobody else has tried...
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    @bicycleguy That's great - I look forward to...

    @bicycleguy
    That's great - I look forward to the outcome!!!

    That's funny about the order of the .h files. I've run it as is for a couple of years, but I have always had all component files in...
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    @bicycleguy, Whoops! How stupid of me! You don't...

    @bicycleguy,
    Whoops! How stupid of me! You don't need AudioLagComp.h for this demo. That's part of the error compensation package. Here's what you do need:


    ...
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    Thanks for all the answers, guys. @WMXZ We're...

    Thanks for all the answers, guys.
    @WMXZ
    We're talking about two inputs on the line-in of the Audio Board.

    The whole data stream of one channel is slipped by one sample with respect to the...
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    @MikeDB - thanks. Yep, I just confirmed that the...

    @MikeDB - thanks. Yep, I just confirmed that the trouble still exists on the T4, see here. Are you saying that a mere mortal might have a shot at fixing the problem, or is it so buried in...
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    I2S input synch error still exists on T4...

    For a couple of years now I've posted about the "bug" where the two I2S channels randomly are out of synch with one another by a single sample. This apparently is a problem on many MCU's, so it's...
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    Not arguing with you, and I know it's not just a...

    Not arguing with you, and I know it's not just a Teensy problem, but I can't think of a single reason why this should be true, after all we have clocks all around the I2S interface, and 44.1...
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    @DD4WH - Have you had a chance yet to look...

    @DD4WH - Have you had a chance yet to look whether the T4 has cured the "twin peaks" bug that has driven me (and possibly you) crazy over the past couple of years with quadrature I2S inputs on the...
  31. AudioSDR - A single Audio block SDR (software defined radio) processor/demodulator

    I'm pleased to announce that I have finally uploaded my AudioSDR project to Github here. I've had it working for many months now, but wanted to give it a good workout before releasing it.
    ...
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    Sticky: @Paul, I just noticed that you asked at the top...

    @Paul,
    I just noticed that you asked at the top of this thread for bugs/suggestions related to Teensyduino 1.47 to help with your next go around. I posted a couple of threads in "General...
  33. Yes - sorry.

    Yes - sorry.
  34. Resolved - see new thread

    Resolved - see new thread
  35. Compiling custom Audio Library compatible classes for Teensy 4

    In the thread F_CPU_ACTUAL error in Teensy 4 but not Teensy 3 the issue of being unable to compile code that included custom (home-grown) Audio Library classes for the T4 was introduced. I have...
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    Thanks, however there is nothing in my PM inbox...

    Thanks, however there is nothing in my PM inbox yet (5:15pm) - don't know how long it usually takes...:confused:
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    Hi Dan - I presume by "rigorous testing" you mean...

    Hi Dan - I presume by "rigorous testing" you mean a mechanical/assembly workout?? Count me in for any alpha/beta testing!

    FWIW - I would certainly vote for retaining access to the GPIO pins.
    ...
  38. A couple of more data points: 1. The audio...

    A couple of more data points:
    1. The audio passthrough example in the IDE Teeny4-->Audio-->HardwareTesting--> PassThroughStereo compiles without problem (it's almost the same as mine above!!!)
    2....
  39. Seems like it might be a problem for all...

    Seems like it might be a problem for all "home-brew" audio objects! I've tried several, here is the simplest example I can think of - a do-nothing pass-through object:

    ...
  40. I got the same error last night when attempting...

    I got the same error last night when attempting my first port:


    In file included from C:\Users\Derek\AppData\Local\Temp\arduino_build_495648\sketch\AudioSDR.h:31:0,
    from...
  41. Different versions of arm_math for T3 and T4 in Teesyduino...

    I've just started porting my software to T4. I make extensive use of arm_math, and in the past I've had to update arm_math.h to avoid using deprecated routines (which come with a warning that they...
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    Hey Daniel, You made my day when I saw this ...

    Hey Daniel, You made my day when I saw this thread! I have a very simple question - I'm sitting here trying see just where the fexible breakout fits into the grand scheme? I can't, for the...
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    Silly me!!! I just noticed TallDog's thread. ...

    Silly me!!! I just noticed TallDog's thread. I'll sure be ordering some of those - his T3.x boards have been great.
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    Breakout board for the T4?

    I'm looking forward to getting my T4's! However I will need access to the 10 extra GPIO pins on the bottom before I can do any serious work with it. Has anybody designed a breakout board at this...
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    Just in case you are not aware - many/most SI5351...

    Just in case you are not aware - many/most SI5351 (used in the Adafruit module) libraries provide a calibration function for the XTAL oscillator. You only need to calibrate at one frequency, ie...
  46. @KurtE :confused: What's the problem??? ...Just...

    @KurtE
    :confused: What's the problem??? ...Just use a uint9_t and you should be good to go :rolleyes::cool:
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    I've never done that on any of my projects. For...

    I've never done that on any of my projects. For example in my SDR project, here is the SGTL5000 initialization code

    AudioNoInterrupts();
    codec.inputSelect(AUDIO_INPUT_LINEIN);
    ...
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    ... and donj't forget you can set the line-in and...

    ... and donj't forget you can set the line-in and line_out gains by setting the voltage range on the SGTL5000 in 1.5 dB steps for example:

    codec.lineInLevel(15); // Set codec input...
  49. Has anybody tried Adafruit's 3.5" 320x480 -...

    Has anybody tried Adafruit's 3.5" 320x480 - HXD8357D (PRODUCT ID: 2050), or the version for their Feather boards? They're expensive ($40), but if they work I'd be prepared to give it a try......
  50. Hi guys, I'm looking to completely redesign my...

    Hi guys,
    I'm looking to completely redesign my half dozen or so Teensy prototyping systems (with the impending arrival of the T4) and these will include a new display. I've been trying to follow...
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