I don't quite follow this article. Is that orange-arrow line supposed to be amps ?? If so exactly is it changing direction if the the rails are fixed ??


https://www.allaboutcircuits.com/te...st-decay-mode-h-bridge-dc-motor-applications/

and when it says "Fast decay mode is a technique that uses FETs instead of diodes" does that mean avalanche rated FETs ?

 

Is that orange-arrow line supposed to be amps ??

Yes, the orange-arrow shows the current path.

If so exactly is it changing direction if the the rails are fixed ??

The inductor and incudec vboltage is the answer to your question.

and when it says "Fast decay mode is a technique that uses FETs instead of diodes" does that mean avalanche rated FETs ?

No.