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    Teensy is sensitive to shortcuts on conductive...

    Teensy is sensitive to shortcuts on conductive surfaces, ESD pad, metallic workbench, .... a bare board needs to sit on a non-conductive surface, especially with pins soldered.

    Teensy are...
  2. The resistor dividers could be done all the same,...

    The resistor dividers could be done all the same, actually it would make voltage reading and calculation much simpler. You would just lose one bit of precision at the lower voltage end of the battery...
  3. A 12V voice activated corridor switch relay could...

    A 12V voice activated corridor switch relay could be a simple and easy solution for this.
    It has an adjustable timer and a microphone input that you could just connect to an audio out, either by...
  4. If the preamp has no power switch, you might...

    If the preamp has no power switch, you might connect it to the slave side as well and use the TV or whatever signal source on the master side. The master-slave sockets usually have a potentiometer to...
  5. Is it coaxial S/PDIF or optical? Is the setup...

    Is it coaxial S/PDIF or optical?
    Is the setup automotive 12V or mains powered?

    Actually you would not need a Teensy or any other microcontroller for this task. If signal is present, the 12V...
  6. Hmm... Could it be possible, a flashable binary...

    Hmm... Could it be possible, a flashable binary has not a proof re-relation to the originating source code, that is, nobody can prove that a binary is made from a specific source or maybe another one...
  7. Vocoding is a kind of re-synthesis, but if done...

    Vocoding is a kind of re-synthesis, but if done with enough resolution, it still gives the best results for a pitch shifter.

    Here is a non-arduino library called soundtouch, that could be inserted...
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    HDMI is differential pair at high speed. Also, it...

    HDMI is differential pair at high speed. Also, it can be multilink = mutipair.
    I do not see any chance to read a specific pixel out of that data stream without adding a really fast FPGA with this...
  9. Thread: Midi 2.0

    by flashburn
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    https://www.usb.org/sites/default/files/USB%20MIDI...

    https://www.usb.org/sites/default/files/USB%20MIDI%20v2_0.pdf
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    A wider form factor could span two parallel...

    A wider form factor could span two parallel breadboards instead of one and still make more pins accessible.

    A Problem is non-standard connectors. See 4.0 SD card. It is always a hack to make the...
  11. Yes, but also this would demand some expense, to...

    Yes, but also this would demand some expense, to make PCB etc. Still it is absolutely possible to make Teensy 4.1 5V tolerant, to a certain extent. The only issue is pin function, input or output,...
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    The SSR are a simple way. The only problem (or...

    The SSR are a simple way. The only problem (or more a feature) they have is their high slew rate on the switced side. So to compensate this, a few extra parts are helpful, or you choose a SSR...
  13. The LSF0108 plus transil clamping diodes on the...

    The LSF0108 plus transil clamping diodes on the 5V side to both power rails and a current-limiting resistor facing the outside world would make it almost fool proof.

    Still, I can not understand...
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    good idea! Also it would be nice to have a LDO...

    good idea!

    Also it would be nice to have a LDO with a bit more max input voltage. This could help with adaptors to USB-C, which could provide more or could also erratically provide too much for...
  15. To limit the current on a MCU pin, especially if...

    To limit the current on a MCU pin, especially if an input signal can become low impedace like a potentiometer set on the edges, it is good habit to put a resistor of 180Ω with 3.3V systems or 330Ω...
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    Usually a millisecond of delay should do well....

    Usually a millisecond of delay should do well.
    The timing seems to be not the same on all pins, but with the millisecond it should always be on the safe side.

    When I use the ADC i read twice the...
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    What about a proper heatsink on the MCU? one that...

    What about a proper heatsink on the MCU? one that also fixes the BGA to the PCB with enough flex and force in the fixture to keep things going after a Teensy has been pried off a breadboard, or...
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    Hmm. I'd connect the grounds to the 7805 GND in a...

    Hmm. I'd connect the grounds to the 7805 GND in a star configuration, not flying daisy chain. Also, the 12V of both SSR close to the power supply, flyback diodes across inductive loads, plus a...
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    So this board uses a LPT interface, right? An...

    So this board uses a LPT interface, right?
    An off-the-shelf USB to DB25 adapter cable adds LPT to the OS. I'd give it a try before re-inventing the wheel.
    What does transfer speed matter in this...
  20. No, the change of phase does not have to be exact...

    No, the change of phase does not have to be exact every cycle of the frequency. If generating constant frequencies, this just happens automatically.
    The more stable the frequency, the more silent...
  21. I've made the experiment. Two frequencies, 400.0...

    I've made the experiment. Two frequencies, 400.0 Hz and 400.0166 Hz, the phase relation needs 60 seconds to turn 360, smoothly without jumps, which would make a beautiful seconds hand.
    21369
    Last...
  22. +1 Such an instrument has a certain inertia,...

    +1

    Such an instrument has a certain inertia, so an abrupt phase shift per second will make the indcator overshoot or oscillate, as this abrupt phase shift would not normally be encountered in...
  23. When dealing Bluetooth, 5 is the way to low...

    When dealing Bluetooth, 5 is the way to low latency, because it has even faster negotiation than 4 or LE, especially in crowded WiFi coexistance situations.
    I've done some BLE MIDI in the past,...
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    @Manu: Sorry, if I got too upset about you...

    @Manu:
    Sorry, if I got too upset about you trying to say the delay function is inferior to your piece of code, even if your code has violated all common sense of programming logic.
    And?
    No, I did...
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    And? What else does this do other than shifting...

    And?
    What else does this do other than shifting electrons on the power line? It is blocking as well. Also it has the chance to wait for ages if it encounters overflow....

    BTW what is blocking?...
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    Fantastic! Go on for the 12 bit. It is so good...

    Fantastic!
    Go on for the 12 bit. It is so good to have an Amiga again. Thank you!
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    I totally agree with being a bit conservative...

    I totally agree with being a bit conservative when designing a core product.

    If it incorporates relaxed design rules, the user may add just very little "exception" to good design, because errors...
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    You did not mention linux in your post....

    You did not mention linux in your post.
    Unfortunately I do not know the recent developments in PyAudio on RPi.

    JACK Audio Connection Kit has resampling features with libsamplerate...
  29. www.sensei-synth.de is offline. What happened?

    www.sensei-synth.de is offline. What happened?
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    Up to now USB audio is 16bit 44.1kHz only. If...

    Up to now USB audio is 16bit 44.1kHz only.
    If using a Windows computer, this will connect to Microsoft Soundmapper, which does resampling if necessary. An app connecting to the Teensy needs to use...
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    NXP is based in Einhoven, Netherlands. ...

    NXP is based in Einhoven, Netherlands.

    https://en.wikipedia.org/wiki/NXP_Semiconductors
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    Made in Europe quality, reliability, worth the...

    Made in Europe

    quality, reliability, worth the price
    It would be super to have a licensed production in Europe, as a backup in case of orange problems, or to have an economic and safe supply for...
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    Backup Strategy?

    When I see the news about Portland and the States in general, I get the idea that Teensy could suddenly be lost without notice.
    Is there a backup strategy for such a case? A trustworthy person...
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    Did you inspect the Teensy with a magnifying...

    Did you inspect the Teensy with a magnifying glass and good light?
    Sometimes with these dense ciruits a tiny stray solder bead or a tin whisker can lock it all.

    A latched-up CPU can happen not...
  35. @MarkT Thank you for going more into the theory...

    @MarkT
    Thank you for going more into the theory behind this.
    I guessed this is far more than necessary to discuss the subject.
    Actually, the '6dB a bit'-rule is a good estimate for audio in the...
  36. There are many ADC on the market with 127dB noise...

    There are many ADC on the market with 127dB noise floor, which counts to more than noise free 21 bits.
    And even DAC with 135 dB or more are massively available within budget price range.

    Noise...
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    :confused: USB host on an ECU? What if a...

    :confused: USB host on an ECU? What if a connected device crashes the ECU and shreds the engine? It would be a hell of a job to make that one really safe... add more timers, watchdog and backup.
  38. Some MIDI devices have non-standard optocouplers...

    Some MIDI devices have non-standard optocouplers or circuits.

    A solution that worked for me is to solder a 330Ω resistor across pins 5 and 4 of one connector of the cable, obviously on the cable...
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    Audio Tool import issue

    The audio tool has a new issue when importing a project:
    Some connections are not displayed and not established.
    As example see attached screen shot taken from importing the Vocoder19Band example....
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    Ah, I forgot one thing: The rotary encoder, did...

    Ah, I forgot one thing: The rotary encoder, did you use a breakout with filtering or build a debounce filter around it? Teensy 4 is so fast, it easily triggers on contact crackle and bounce,...
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    If you do not use the onboard memory and SD and...

    If you do not use the onboard memory and SD and have not populated the memory chip, these pins are usable for other things, but keep in mind there are 10kΩ pull-up resistors to 3.3V on pin 6 and pin...
  42. "Eternal use" is the logical opposite of "re-use...

    "Eternal use" is the logical opposite of "re-use wherever".

    One disposable variable is for one function only (considering loop as a function as well, which is logical), it must not be reused in...
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    Post schematics, please. For example: The issue...

    Post schematics, please.
    For example: The issue with the rotary encoder looks like you mixed up pins. This can happen quite easily, because the logical numbering of pins does not correspond to the...
  44. I have no idea of Juce, but this could be a hint...

    I have no idea of Juce, but this could be a hint to search for the information:
    You could change the name of USB by usb_names.h and then use the Device Friendly Name...
  45. Looking at the board of the display, I see many...

    Looking at the board of the display, I see many possibilities for intermittent short circuits at the "solder" of the flex.

    This looks gruesome!

    Apply a neutral flux and touch it up with a nice...
  46. Just declare the variable before void setup()...

    Just declare the variable before

    void setup() {
    by writing it so

    int i = 0;

    void setup() {
  47. I've encountered similar mysterious freezes in a...

    I've encountered similar mysterious freezes in a T4.0 project (that guitar effect thing), and found out the freezes do not occur any more if I leave out these allocations of temporary variables
    ...
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    One month to italy, now at customs... the beta is...

    One month to italy, now at customs... the beta is to be written off.
    Exp-tech is not an option. 17.85€ shipping. :mad: 10€ upcharge to the real price. WHAT?

    Actually Teensy in Italy cost 1.5...
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    Frame sync? BNC word clock is the same as...

    Frame sync?

    BNC word clock is the same as LRCLK.
  50. ;) Maybe you've set in the UEFI: USB...

    ;) Maybe you've set in the UEFI: USB Keyboard/Remote Power On to "enabled" to allow the system to be waked up by an USB keyboard or remote controller.

    This switches the USB+5V to standby 5V to be...
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