Abstract: This paper presents a novel class H audio amplifier design that allows full class H operating region, optimizing the efficiency of the class H audio amplifier architecture. Class H audio ...

Abstract: The vacuum tube train can break through the difficulties of wheel-rail resistance, air resistance and noise of traditional wheel-rail railways. It can reach ultra-high speed of more than 600 ...

From handheld to corded, self-emptying to stick models, these are our resident cleaner’s favourite vacuums for a spotless home The best cordless vacuum cleaners, tested How to make your vacuum cleaner ...

Second generation écoute vacuum tube wireless noise cancelling headphones improve comfort and sound in a slightly modified design. What if headphones were not trying to imitate a hi-fi system but ...