G’day @Goblin
from memory the PWM is 12v, but we are still looking at the the entirety of cockpit panels not just the CDU panel that this example was off.
Thanks for the input though, electronics is definitely not my bag,
hence i’m creating the MMjoy board to help all the other misfits who look at electronics & stare until their eyes glaze over in confusion and walk away with little more than a migraine headache…
I very much (unashamedly) lean on @v81 for all my electronics tomfoolery
so if you notice me saying something that isnt quite right, (dont blame v81) please make sure to clarify it, the last thing i want to do is unintentionally spread misinformation.
I appreciate the input , not just myself and @Lobinjaevel 's benefit but for everyones
sometimes @v81 gets tired of slapping me and has to swap arms 
cheers