So a few of my buddies and I (all undergraduate Electrical Engineers) were discussing FM signals. We found we all understood the modulation and signal profile itself, but none of us could think of a good circuit example for how the carrier wave and modulating wave are combined.
I could instant think of how to code an MCU and then use a filter to generate the FM signal so we all accepted that possibility.
But knowing how long FM has been used and that the rise of modern, cheap MCUs is relatively recent in electronics, there must be a host of way to accomplish this modulation scheme.
I'm just wondering if any of you know of any easy ways to do FM? Simple circuits would be great! But I'm also interested in any and all more complex methods (explanations would be appreciated!)