hi all, logan has run up against a small problem and its got me stumped, he has set up the circuit as per erics drawing but we couldnt get to make the fan run. so we stripped it all back on the bread board untill all we had was the bc547 transitor, no fan etc. what we get is only 5v at the emitter not the exspected 12V.
i have checked and double checked in the datasheet and i am sure we have the transitor the correct way round. so does anyone have any idea why we would see 12v at the collector but only 3.98v at the emitter when the transistor is "switched" on?? i have tried several of theese transistors from the same batch and all are the same. when the other transistor is also added it also shows low voltage at the emmiter.
many thx chaps