RF transmitter and Receiver

Hi, I need some help for creating a transmiter and receiver circuit for my son high school engineering project. Main requirements are: 1) use minimum components as possible for RF transmitter and Receiver. 2) minimum input for transmiter are 4.
Can somebody help me for this this project?

Hello Cittaratha, welcome to the Tech Forum.

Here are some tutorials on how to create a transmitter/receiver circuit that should prove helpful for you. Good luck with your project!

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