Yesterday I Learned

1. Speakers can act as mics. Ref: Speaker as a Microphone - Why can a speaker work as a microphone? I forgot where I learned about it. Similar to how motors when spinned produce electricity, the diaphram of the speaker can also be vibrated to produce a varying signal that resembles the input sound. That makes sense. 2. Moden WI-FI routers use the property of wave to have constructive and…