Hi, I'm checking for possible problem with a simple H bridge motor control circuit I'm designing using only NPN transistors. The motor supply is 4.5 V and the base will be 'switched' using a 5 V supply. I understand that as long as the transistor is in saturation there is no appreciable voltage drop from the collector to the emitter but what about from the base to the emitter? Something I have read elsewhere suggests there is a 0.7 v drop here which would put the base voltage at 4.3 V and below the value of the (4.5 v) emitter voltage which means the transistor wont work as expected? Thanks for any help and advice.