Re - Custom Simple Linear Regulator

(extends:: Custom Simple Linear Regulator)
i may be an idiot but most voltage regulator circuits i've come across in internet appear to be too unstable or of not enough range for design target when simulated !! (usually the simulation appears to be the way batter quality than the real life build) so not enough range in simulation - is this for any use

so a bit of my research history on this subj. ::

first i thought that for successful design of a voltage regulator is required a good voltage reference ...

it may be that way but the precision voltage reference alone does not define a thing - more important is what you do with it or other words how you utilize it with respect of the rest of the circuit - so it turns out you can "define" your voltage without any specific voltage references - in the following test ::

the R4 is required for the simulation to run (for the circuit to be defined in the Solve Electric) -- i guess i added the diode for a zener - anyway this modified constant current source turns out to be very precise comparator for external voltage ::

wow -- a bad example -- anyway 1 of my early struggles -- the "comparator" is formed here by Q5 Q6 (Q9) if the TVP (test voltage point) increases the Q6 and Q9 start to open cutting off the Q11 ((?? all this for voltage reference ?? for precision constant current by J1 J-fet ... wow XD)) . . . so the Q1 has ??? high precision voltage on it's base and if PF gets too high the emitter-base current of Q1 reduces reducing the darlington's - Q2 Q10 - current - which in turn maintains PF in required limits - the circuit was never built as i found it too "expensive" or time consuming (along with tuning the real thing)

here's the latest zener ::

and what it's good for ::

???? -- running a scratch supply concept and testing various features -- everything is cool ? ? ? but to get only 20mA usable power (and who gonna build that . . . i'm out XD)

...

an alternative to a grid shown in ® Custom Simple Linear Regulator ::
the minimalist concept::

and minimal cfg for practical usage (the specs on the lower simulation do not apply to this grid - look the plots) -- doing the over current limiting here was a bit tricky


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