I don't have an scope, i'm a south american student and here, the osc are very expensives.. but i can check on my faculty lab on tuesday.
I changed R6 to 270ohm.
All this i check with my multimeter (an UNI-T UT70A) with one of the probes to ground.
I change the Vin to 17,5 (another non-regulated voltage source)
Putting the Vref as 10V, i won't get 22V, and i get 15,6V (which seems to be the max i can get as output)
point8(p8) = 14.7
point2(p2) = 0,2
point9(p9) = 11,1V <-- opamp is saturated to 12V (V+)
point16(p16) = 0,9V
Now, all the test i'm describing next, the voltage ref is 14,4 and i change the load
With no load and i get almost the same with R2=4700ohm (Vout = 14,4V)
p8 = 16,7V
p2 = 16,6V
p9 = -1,4V (???) <-- trying to regulate down?
p16 = -1,6V
With 100ohm as load (Vout = 14,2V)
p8 = 13,9
p2 = 5,1 - 5,3
p9 = 5,83
p16 = -1,0
with 31ohm as load (Vout = 12,7)
p8 = 12V
p2 = 0,13V
p9 = 11,15 <--opamp saturated
p16 = 0,86V
Tuesday i'm going to get an osc on my hand and i will check it..
thanks in advance
i don't get anything more...
Ezequiel