I have about 2 or 3 2907's in my junkbox. Those are my "Last-resort" audio power amplifiers.
it sucks to downgrade superregens.
Also, I found out something interesting. In the first image, when I connected the choke in parallel with a capacitor, I got a bandwidth tank!
but the thing is, I need to fine-tune it.
and before I think about turning the dial only 1/4 of a degree (god help me LOL), I want to know the best way to replace the collector to emitter capacitor with a digital tuner. In other words, instead of turning the dial 1/4 of a degree each time, I want it where I can press a button and the station changes to another station.
I am ok using IC's for this, but its good if I can avoid a microcontroller for the time being.