| It is sometimes
difficult to understand the behaviour of a circuit when the transistors
are drawn upside down.
In diagram A,as the base voltage goes towards the + rail (goes more positive), the collector voltage goes away from the + rail (goes less positive). In diagram B,as the base voltage goes towards the - rail (goes more negative), the collector voltage goes away from the - rail (goes less negative). In diagram C,as the base voltage goes away from - rail (goes more positive), the collector voltage goes towards the - rail (goes less positive). In diagram D,as the base voltage goes away from + rail (goes more negative), the collector voltage goes towards the + rail (goes less negative). |
