Comment by seg_lolr
5 hours ago
"Novel". Those are all Collpits LC oscillator variants, circa 1918. All LC oscillator topologies were thoroughly investigated more than a century ago, hundreds of books have been written about them. A little more humility please
Passive circuits have been novel for a long time now, or at least very very quaint. It is hard to put much stock in a coil when it is banal to walk around with 100 billion transistors in your pocket.
One of my favorite books is Tremaine's Passive Audio Network Design, seems appropriate right now. Passive circuit design is great fun and a lost art.