ELI5: Explain Like I'm 5

Direct-coupled amplifier

Okay, kiddo, so you know how we sometimes need to make sounds louder, like when we listen to music on our speakers or talk on the phone? Well, one way we can do that is by using something called an amplifier.

Now, there are different types of amplifiers, but we're going to talk about a specific one called a direct-coupled amplifier. It's called that because it's a type of amplifier where two different parts (let's call them "blocks" for now) are directly connected without any other parts in between.

One of these blocks is called the "input stage." This is where we send the sound signal we want to amplify. It's like turning up the volume on a microphone when we sing or talk into it. The input stage takes the sound signal and makes it stronger.

But that's not enough for us to hear it loudly, so we also need the second block, which is called the "output stage." This is where the now-stronger sound signal is sent to be played on our speakers or headphones or whatever we are using to listen to the amplified sound.

So, why is it called "direct-coupled"? Well, think of it like this: if you have two toy cars you want to connect, you might use a bridge or a ramp to connect them. But with a direct-coupled amplifier, we don't need any bridges or ramps - the toy cars (or in this case, the input and output stages) are directly connected together.

That's a basic rundown of what a direct-coupled amplifier is. Of course, there are more details and complexities involved, but hopefully, that makes sense to you!