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TeensyMaestro

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Comments

  • g4ivv
    g4ivv Member ✭✭

    I'm happy to hear its working well for you Simon. Pleased to be able to contribute in a very small way towards this great project by Len and yourself, I really appreciate what you've achieved.

    Thanks,
    Jonathan

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    Thanks for finding that, Jonathan, I really appreciate it! I have a set of .001 uf caps ready to install. It will be interesting to see if higher shaft rotation is achievable this way.

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    For the two optical encoders, I removed the external pull-up resistors and installed the .001 uf (1nf) capacitors in place of the .1 uf caps.

    The encoders now have a faster top speed, but otherwise behave the same. CW at 500 Watts does not seem to bother it, even with the smaller capacitors, so I am happy with the result.

    Thanks again Jonathan, I never would have found this myself!

  • g4ivv
    g4ivv Member ✭✭

    Hey Len, I'm really pleased it works for you as well. Thanks for all the many hours you must have put into developing the TeensyMaestro, its a really great project.

    Best 73,
    Jonathan

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    Thanks Jonathan, I appreciate it!

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    Next up for the TeensyMaestro is the ability to choose which slices to show. It currently just shows slices 0 and 1 (typically A and B).

    Now that I have an 8600, I have been using diversity reception a LOT (way more than I expected…) so I really want a way to control slice D volume and AGC-T. For now, a workaround is to open 4 slices then close slice B. Move C and D off screen to get them out of the way. Now select DIV on slice A, and the diversity child will show up on slice B (the only available slice). Since the TeensyMaestro shows A and B, I am all set!

    If anyone else is using an 8600 with a TeensyMaestro, let me know if this trick works for you.

  • NV0E
    NV0E Member ✭✭

    TEENSY MAESTRO PCB CORRECTION

    You may have seen the recent comments in this thread regarding a flaw in the Teensy Maestro PCB design. The following is a summary of the fix.

    We discovered that the slice tuning optical encoders were using pull-up resistors to 5V instead of 3.3V. This poses a risk of overvoltage on the GPIO pins, potentially damaging the Teensy 4.1.

    With help from Jonathan (G4LVV), we’ve implemented a simple and effective fix:

    • Remove resistors R1, R2, R3, and R4
    • Replace capacitors C9, C10, C25, and C26 with 1nF parts


    Since the firmware already enables internal pull-ups, R1–R4 are redundant. Removing them required adjusting the RC debounce circuit, hence the capacitor swap.

    Interestingly, this change improves tuning performance: the encoders now support a higher top speed while maintaining stable behavior.

    The wiki has been updated with revised build instructions and a dedicated warning page to highlight the issue.

    Revised build instructions (see section 5):
    https://github.com/rimuadmin/TeensyMaestro-Hardware/wiki/PCB-Assembly-%E2%80%90-(2)-Rear-of-PCB

    Warning page:
    https://github.com/rimuadmin/TeensyMaestro-Hardware/wiki/PCB-Rev-3-Correction

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