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@ -129,8 +129,8 @@ The PCB files have been made with Eagle 5.11, and can be modified or otherwise r
# Background
The folder **$PICO/docs** also contains some manuals, of which the *C-SDK description*, the *RP2040 datasheet* and the *Pico Pinout* are absolute must-reads when you start writing software. Note that this folder is only created by the **ndabas** script, after manual installation you should find these on the Raspberry website.
For calculating filters I have used the free software from Iowa Hills (http://www.iowahills.com/8DownloadPage.html)
I also used the online FIR filter calculator T-Filter (http://t-filter.engineerjs.com/)
For calculating filters I have used the free software from [Iowa Hills](http://www.iowahills.com/8DownloadPage.html) (website seems tyo be down...)
I also used the online FIR filter calculator [T-Filter](http://t-filter.engineerjs.com/)
# Copyright notice
**The code and electronic designs as well as the implementations presented in this repository can be copied and modified freely, for non-commercial use.