[GreenKeys] DSP TU Progress

[Harold Hallikainen]

On Fri, December 1, 2023 12:02 pm, Gil Smith wrote:
> That is indeed a pretty cool project!   Is there a description of your dsp
> algorithm somewhere?
>

Thanks! An old sketch of the software is at
https://w6iwi.org/rtty/DspTU/DspTuHw221023.pdf#page=7 . It's pretty much
the same as an analog TU but using biquad filters instead of analog
circuitry. All the code is at https://github.com/HaroldHallikainen/DSP_TU2
.




> I have been using kicad for a couple of years now, and it has quirks but
> has been awesome.  I moved from eagle (which has been ruined by
> autodorks).  In parallel I also started learning freecad, initially to
> make some 3d models for kicad, but now I am also using it to design a
> machine.
>
> gil

Great! Back in the 1970s, I taped up circuit boards on plastic film using
supplies from Bishop Graphics. I then got schematic capture and PCB layout
from Dasoft that ran under CP/M. I still have the Houston Instrument
plotter. Then moved to PCB layout software from Advanced Microcomputer
Systems in Florida. Then moved to a company where someone else did the
schematic capture and board layout. Once retired, I've now gone on to use
KiCad. I really like that Digikey and Mouser have links to symbols and
footprints for parts. I used to spend so much time on that!

I've used LibreCAD a little for 2D drawings. I used it to make drawings
for our kitchen remodel.

All fun stuff!

Harold
https://w6iwi.org