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Subject: Re: [JackAl] Arduino IDE version 1.8.8 issues

Cut on the back of the teensy 3.6 near VUSB notation.

On January 21, 2019 at 9:49 PM k7da <k7da@...> wrote:


Jim.?? glad you took the time to explain this, but somewhere along the
line i missed the jumper cutting.? i am also unable to find the card
that came with the teensy.?? so can you give me ( and others that missed
it to) where the jumper is.? it is not obvious looking at the board.

thanks

dave k7da



On 1/21/2019 2:06 PM, Jim Sheldon wrote:

Art,
I didn't see a definitive answer yet and I know Jack is super busy
trying to sort out everyone's problems so I'll answer your question.?
The pad in question is shown on the back side of the Teensy 3.6 (and
other Teensy's as well) pinout card that came with it, as the VIN/VUSB
jumper and it says to cut that jumper if using a battery charger OR
external power.? The battery charger isn't relevant here, but external
power is so the jumper MUST be cut.

Now for the reason which isn't readily apparent.

You are powering the Teensy 3.6 from the 5 volt regulator on the
JackAl board.? If you have not cut the jumper and plug the USB cable
in to re-program the Teensy (or for some other purpose like CAT
control or other serial I/O from the USB port) you are also supplying
a nominal 5 volts from the USB port to the Teensy.? The two voltages
will most certainly not be exactly equal as they come from two
different power sources and they WILL conflict with possible damage to
the Teensy's on-board 3.3V regulator and other circuitry (I know, I
destroyed one by doing this before I figured it out).

So, in this case if you don't cut the jumper, don't connect the USB
cable with the JackAl powered up.? By the same token, if you follow
PJRC's directions and cut the jumper, you will have to power the
JackAl up to get the Teensy operating before you will be able to
re-program it.

If, like me, you sometimes forget these things then cut the jumper
(recommended anyway) and just remember that you have to have the
JackAl powered up to use the USB connection to program the Teensy 3.6
(or to communicate with it for any reason).

Jim Sheldon - W0EB

___________________________________________________________________________________________________
(Art Olson)
12:52pm #129 </g/JackAl/message/129>
Jack
I vaguely recall some discussion about cutting the 5 volt pad on the
teensy. Is this still necessary or am I off target.
Art N2AJO

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