Are you thinking of this Braun teardown? https://www.youtube.com/watch?v=JJgKfTW53uo https://www.youtube.com/watch?v=JJgKfTW53uo That indeed uses a 4-bit micr

Are you thinking of this Braun teardown? https://www.youtube.com/watch?v=JJgKfTW53uo https://www.youtube.com/watch?v=JJgKfTW53uo That indeed uses a 4-bit micro from a Swiss company (The only sonicare teardown I found was a forum post)