This is a dual update of the SPWM inverter project (presented on March 2019).
It's 3 pages addendum together with the main document, that describes a
little more higher power stage driving (8kHz instead of 2kHz) - V4
and automatic MSW driving (from 40% to 90%) - V5.
Both .hex files are included with the document, also there has been the
change of the contact email in the document.