HOW A MICROPHONE WORKS - Science at Home - episode 3

[@goktugyilmaz1504]

Such a good lesson. You explained step by step and made it clear. Thank you very much.

[@dannickstrom469]

Thanks so much! Glad you enjoyed it! :-)

[@raghavendrar3331]

Amazing explanation. Please make a lot of videos 🙏

[@Nshiime]

Great video, super helpful 👍

[@seanrooney4310]

But what is going on at the deeper level? How do audiowaves convert so perfectly to electromagnetic waves?

[@dannickstrom469]

Thanks for the question! The audio waves don't convert to electromagnetic waves. They convert into electrical pulses in the wires. If there is a loud sound there will be a bigger pushing force from the air and it will make the coil in the microphonel vibrate strongly, which means the coil will move a larger distance and make a larger electrical pulse. So a lound sound equals a big electrical pulse. If the sound is very high pitched (high frequency) it means the electrical signal will change very quickly. Every little vibration in the air will cause a vibration in the magnet and therefore a unique electrical pulse. All of this happens very very fast. But when that electrical pulse is played back through a speaker it causes the exact same vibrations to occur, therefore the same sound is reproduced. Be sure to watch the 1st video on the speaker also to get the full picture. I hope that makes it a little clearer. It's hard to explain in just text! Let me know of you have any other questions. 😊😊😊

[@dannickstrom469]

One last extra thing that might help also! You see the green dot on the oscilloscope that shows the voltage? When I talk into the microphone it becomes a line. That's because it is moving up and down so fast that is is completely blurred. So the electrical signal is very detailed and complex. If were able to slow it down by a couple of hundred times we would see a little dot moving up and down for every single tiny little change in the motion of the air near the microphone.

[@seanrooney4310]

@@dannickstrom469 I suppose what my question was is that how can we hear the difference between a loud bang and someone shouting into a microphone, as both would produce a large but also short signal, when both sounds have been dumbed-down to mere electrical impulses? But I guess what you're saying is each sound has a unique sonic signature? Similar to how a piece of string can carry the unique sound of someone's voice when speaking into a plastic cup?

[@dannickstrom469]

Exactly! Each of those sounds would have a unique sonic signiture. If you slowed it down by a few hundred times you would see it clearly. It's just not obvious to the human eye because it's so fast!

[@seanrooney4310]

@@dannickstrom469 Nicely put. Great videos dude. Apparently Isaac Newton had his best discoveries during a lockdown lol Keep up the good work!