Hi,
not a lot to it, just place a Zener across each input, it will limit the max voltage input to 4.7V, ie within the BoBs sweet spot.
Don't need a circuit board just the the Zener tail into the input screw terminal with the other lead going to COM. Note the band (polarity) of the Zener.
Don't really need another resistor because of the output impedance of the AB outputs....don't you just love Thevenin's Theorem!
Craig
Sweet. No clue who that man is but clearly he was smarter then me 😂😂.
As per diagram:
Why are the Zeners on the 0V to the common?
I thought they would be on the A and B?
Or, is what I am looking at that the Zener draws some of the power from A and B dumping it into the ground?
So if A puts 5.2V from encoder to Bob the Zener will take 0.5V away from that to the ground allowing 4.7V to continue to the board..?
And for the drawing, do I just sodler the junctions (little green circles)?