It is not every day that we find a web site or a YouTube video that discusses negative resistance and the Barkhausen criteria. But that day has arrived my friends!
This All Electronics fellow appears to be Italian. I really like his enthusiasm. The universe! Differential equations! The passion seems to jump out of the video when he talks about how the negative resistance "enhances the oscillation!" It is really great.
He even talks about how thermal noise gets the oscillation going. This is something that I struggled with as a kid. It took me a while to find a good source that explained this. He explains it very well.
Thanks to master homebrewer Pete Juliano (another Italian!) for alerting us many years ago to the Barkhausen criteria. And thanks to Al Williams at Hack-A-Day for alerting us to this great video.
Here is the All Electronics channel on YouTube: https://www.youtube.com/@AllElectronicsChannel
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