Transistors 1. A transistor is a double p-n junction semiconductor with three terminals, a. the emitter (e), b. the base (b) c. the collector (c). 2. Figure 1 below shows the illustration of a transistor. It looks like a combination of 2 p-n junction diodes. (Figure 1) 3. In a transistor, the emitter emits charge carriers (free electrons or holes). 4. The charge carriers move towards the base. 5. Under certain condition, large amount of the charge carriers will pass through the thin base layer and to be collected by the collector. Types of the Transistors 1. There are 2 types of transistors: a. npn transistor b. pnp transistor 2. Figure 2 below shows the illustration of the npn and pnp transistor and Figure 3 below shows the symbol of both npn and pnp transistor. 3. For the symbol of the transistor, the arrow shows the direction of current. Take note that, for the emitter and base, the current always flow from the positive terminal to the negative terminal.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Transistors
1. A transistor is a double p-n junction semiconductor with three terminals,
a. the emitter (e),
b. the base (b)
c. the collector (c).
2. Figure 1 below shows the illustration of a transistor. It looks like a combination of 2
p-n junction diodes.
(Figure 1)
3. In a transistor, the emitter emits charge carriers (free electrons or holes).
4. The charge carriers move towards the base.
5. Under certain condition, large amount of the charge carriers will pass through the
thin base layer and to be collected by the collector.
Types of the Transistors
1. There are 2 types of transistors:
a. npn transistor
b. pnp transistor
2. Figure 2 below shows the illustration of the npn and pnp transistor and Figure 3
below shows the symbol of both npn and pnp transistor.
3. For the symbol of the transistor, the arrow shows the direction of current. Take
note that, for the emitter and base, the current always flow from the positive