I was curious about some of the design changes that happened throughout the years on the OSPI version of the board.
I can see that you started off in 1.2 with a simple half-wave rectifier, moved onto a full wave rectifier and then a bridge. I’m curious to understand what prompted the changes there? Were some users seeing issues with a weaker filter or was this change prompted by something else?
I also see that you started using one additional capacitor of 0.01uF starting with version 1.40. I’m curious to see if this was also prompted by filtering issues or if there’s something else going on.
I assume that D3 is a Zener diode to protect the PI? The Eagle diagram shows it as a regular diode.