13.3. CLASS B AMPLIFIERS WITHOUT TRANSFORMERS

The intention was to get rid of the transformers which had been used to “split” the input signals into two halfwaves. Without transformers we cannot “turn around” one half of the input signal. So it is necessary to let the current flow in both directions. This is not possible with transistors of the same type.

We have to use a combination of an NPN and a PNP transistor. They must be very similar in characteristics and therefore they are called to be complimentary.