Alright kiddo, a regenerative circuit is a special kind of electrical circuit that can amplify radio signals. It works kind of like a game of telephone. You know how when you whisper something into your friend's ear and they whisper it to their friend, and so on, it can get louder and louder? Well, the regenerative circuit does something similar.
First, you need a special kind of circuit called an oscillator. This circuit makes a sound wave that we can't hear – it's like a secret code. This code gets sent out into the air as a radio signal.
But, the radio signal is usually too weak to be heard. That's where the regenerative circuit comes in. It takes the weak signal and sends it back through the oscillator again and again. Each time it goes through, it gets louder and louder, like our game of telephone.
Eventually, the signal gets so loud that we can hear it through a speaker. And that's how a regenerative circuit can amplify radio signals!