i hv try the following circuit practically,
results:
V_AC = 12V
V_DC = -12V
V_BC = 5V
so.... i think the +ve voltage regulator with -ve configuration is working well, rite? (if the node C is going to be the circuit reference node)
with this configuration, of course i will find that my V_2 is floating...
i consider the node C as my circuit SIGNAL GROUND or VIRTUAL GROUND, correct? (kindly giv me your comment...)
when i connect the node C to the EARTH GROUND terminal (from the DC supply or AC supply in the laboratory), the measured results were still be the same with the above values... (kindly giv me your comment...)
finally, i would like to know if my circuit load (instead of one simple op-amp) is going to be very complex, will this kind of configuration going to give me any troubles? or it is well better to use the following circuit involve with the negative regulator....
kindly give me your commentssssssss which circuits will be the better solution ( ++ your reasons)...
thanks A LOT, thank you........
:|
Added after 8 minutes:
sorry....
ERRATA....
my first circuit diagram.... the text "7812 IC" shall be "7815 IC"..... (15V)
actually i simply put it in for your reference as i deemed you may unfamiliar with the LM340T15 of national semiconductor... (& the LM324N of ST).