I made this "op-amp e2g" about a year ago, intending to use it for a power supply. It's not a realistic op-amp, but it behaves in a realistic way and it realistically has to be powered; that's the point of it. So now I've built a voltage regulator around it. Its output is the green node.
The 'op-amp' in the corner outputs the error voltage times 1000 and clamped to 3V to the blue node.
The rest of the circuitry should be quite realistic. I'm not sure why I chose 2V, but it works for the LEDs, one of which draws 2A. That's close to the PSU's limit. If you want to change the voltage, change the two 5kR resistors below the 10mm wide N-channel MOSFET.
If you want to limit inrush current with an inductor, 1mH should do the job.
Original op-amp e2g:
http://everycircuit.com/circuit/4998086501072896
What did the op-amp designer say when he found it had a bad frequency response?
"This does not Bode well."
