The "Electronics Engineering Video Blog" (EEVblog) is a long-running channel on YouTube, hosted by "crazy Aussie" Dave Jones. He covers a wide variety of technical topics, but there has been a recent series on microphones which may be of interest to many people in these forums.

Dave had guest-engineer Doug Ford, former design engineer at Rode over for a series of tutorials on microphone fundamentals and design....

EEVblog #602 - Introduction to Microphones
EEVblog #605 - Fig.8 & Cardioid Microphone Patterns
EEVblog #608 - Condenser & Electret Microphone Construction
EEVblog #609 - Condenser Microphone Design Tutorial
EEVblog #611 - Electret Microphone Design
EEVblog #616 - How Microphone Phantom Powering Works

And another video of Dave doing a "tear-down" of his own Sennheiser G3 wireless mic kit...

EEVblog #571 - Sennheiser EW100 G3 Wireless Microphone Teardown

Thanks for these Richard. Going to make time to watch.

Best to you.

Jonathan