I put a LM7812CT regulator circuit on the output of a wall wart that was labeled 12 vdc at 1000 ma. (Without the regulator, the actual output measured over 15 vdc under a 184 ma load; I never loaded it any heavier.) With the regulator, I get the following readings:
no load: 12.03 vdc
250 ma: 11.96 vdc
333 ma: 11.95 vdc
500 ma: 11.90 vdc
1000 ma: 10.82 vdc
Obviously, it's not capable of a full amp, but is it ok to use continuously at 500 ma or does the 1/10 vdc sag indicate something's overloaded?
Thanks.
no load: 12.03 vdc
250 ma: 11.96 vdc
333 ma: 11.95 vdc
500 ma: 11.90 vdc
1000 ma: 10.82 vdc
Obviously, it's not capable of a full amp, but is it ok to use continuously at 500 ma or does the 1/10 vdc sag indicate something's overloaded?
Thanks.