Why Does a Microphone Squeal When It Gets Close to a Speaker?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why does a microphone squeal when it gets close to a speaker?

The Big Idea

A microphone listens and a speaker talks, and sometimes they get stuck in a loop! The mic hears the speaker, and the speaker makes it louder again. Round and round it goes until you get a squeal called feedback.

Mic Listens

Step one: the mic listens. A microphone catches sound and turns it into a tiny electric signal. An amplifier makes that signal stronger so a speaker can play it.

Speaker Talks

Step two: the speaker talks. The speaker turns the signal back into sound that fills the room. If the speaker is close to the mic, some of that sound goes straight back in.

The Loop Grows

Step three: the loop gets louder. Each trip around the loop makes the sound a little bigger. Very quickly, it turns into a loud squeal.

A Closer Look

Let's take a closer look! Your voice goes in first. The microphone turns it into a signal. The amplifier makes the signal bigger. The speaker plays it, and the loop starts again.

Quick Facts

Quick facts! You can break the loop by moving the mic away from the speaker. You can also turn the volume down. Or you can point the mic away from the speaker. Sound crews do this to keep ears safe.

Think Like a Scientist

Now, think like a detective! Draw a loop with arrows: voice, microphone, amplifier, speaker, and back to the microphone. Mark three ways to break the loop. Then think about why turning down the volume helps. Do not make feedback on purpose, because it can be very loud.

Outro

Feedback is a sound loop, and you can break it. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!