Im trying to make some fuzz pedals for guitar using a single transistor. The one on the right is as far as i understand a common emitter amplifier with negative feedback, I somehow can't find anything about how to calculate the voltage gain of this configuration, but its very common in fuzz pedal circuits.
The one on the left has a diode in place of the resistor and as far as i understand this isn't negative feedback. The diode is supposed to limit the voltage swing from the positive side. I made this circuit in LTspice, and i noticed that the DC voltage at the base and collector is the same, but I assumed that it would be 0.7V higher at the collector because of the voltage drop across a diode, that wouldn't allow the diode to limit the signal though, so I'm not sure how this exactly works. Why is the DC voltage the same at the base and the collector, and how exactly is the voltage gain calculated, because I can't find that online anywhere.