Driver Transistor Is Also Called Load. This circuit is just the power driver for the speaker. A transistor can also used to drive and regulate the speed of the dc motor in a unidirectional way by switching the transistor in regular intervals of time as shown in the below figure.
It is the first condition carrying the transistor as bipolar junction transistor bjt. Transistors are often used as electronic switches to control loads which require high voltage and current from a lower voltage and current. The basic structure of a resistive load inverter is shown in the figure below.
The most common example you ll see of this in a physical computing class is to use an output pin of a microcontroller to turn on a motor or other high current device.
There is no external driver needed for this type of components. Usually the signal from a microcontroller or logic gate does not possess sufficient drive current to power an led directly. Multiple choice questions and answers on transistor audio power amplifiers. Transistor basics links for reference the learning circuit how transistors work.
