Hi TechDave, (welcome to the forum by the way).
There's a pretty wide range of options for remote/radio control circuits, depending on what its to be used for. You could design the entire radio and control circuit from scratch, or buy a pre-made module for as little as $10.
Here's some more questions to help point us in the right direction:
- What are you trying to control? Just a simple on-off control, or something more complex like driving a car or robot?
- What distance are you trying to transmit over?
- Are you wanting a handheld remote with buttons, or for this to be controlled by a computer?
- Are you doing this for work or school or fun?
- What's your budget?
Send us some more details and we'll see what we can find!
Best Regards,
MetMan