hi , i can't seem to get these 5A ic's to work .i am using the simple circuits off datasheets etc. i have not connected any capacitors ,but used protection diodes a couple of times ,thinking maybe spikes killing them .. most of them , [6 so far ] worked with no load , only had dmm connected . when i connect a 1.2A load [2 light bulbs ] there is nothing , no flash , clicks , pops , smoke or smells ,very disappointing .. after this ,the volt meter just jumps all over the place in the MVolt range... i am sure i have pins connected right ... with the last one , i tried with a 34Ma load [led] and it worked as its supposed to. until i tried 500Ma load,"died".. .these are branded with the national semiconductor logo , brought from 2 different sellers [ebay, yeah, slow learner ] they were marked with different "batch" #s ....surely they all could'nt be fakes, dodgy , faulty units .. heres a couple of pics ..oh, by the way , the resistor is 220R from Vout to adj and then to -neg via a1 or 2k rheostat....thanks in advance for any ideas....