The software is a little bit tricky, mainly because the audio must be at 48k sample
rate while the Teensy system software is hard-coded to 44.1k.
But, „hex“ files are provided such that you can simply burn the hexfile to the Teensy
and that’s it.
You have two choices:
a) the „softerhardware“ design from makerfabs
b) a standard Teensy4 with a standard Teensy AudioShield (that is what I am using)
It depends how many „bells and whistles“ you need (Mic input, PTT input, etc. etc.),
if you just need a CW keyer then you only need
- two I/O input lines for the Paddle
- connect headphone to the jack of the AudioShield
and then it is quite simple to build.
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