Try this:
Q2=2N4401
L1=200uH, Resr=0.1 ohms
C2=10uf
RL=33
R1=50
C1=300pf
and note the output current level.
I did, and unfortunately it was pretty near zero. In other words, the circuit simply did not work with these values.
First of all, the transistor. I tried many of the ones I have in LTspice's parts box; the only one I could get to work reliably was the 2N2222.
However, having said that, I did get this version of the circuit to work:
**broken link removed**
I should say a few things about this. Not only does it work, it works
amazingly well!. In fact, what you have here, my friend, is a real Minty Boost contender. It actually works better than my converter here. Note load resistor value; it can deliver the full 1/2 amp into that load at as close to 5 volts as never mind, so it really qualifies as a very usable USB adapter powered by 2 AA cells. Not bad!
Of course, it needs regulation. How would you suggest regulating this? Can one use the same simple scheme I used (zener diode and transistor)? Where would you connect the regulator transistor?
I think I'll get parts for this as well and play with it in Real Life.
Simulation posted below (do you have LTspice?).