Crystal diode and transistor amplifier circuit 3

A transistor has three different conductive regions, such as two P-type regions sandwiching an N-type region (P-N-P), or two N-type regions sandwiching a P-type region N-P-N, which form the basic part of a transistor - the core. A P-N junction is formed between every two conductive regions, so any type of transistor contains two P-N junctions. According to their differentdiode functions, they are called emitter junction and collector junction respectively. Two junctions divide a complete crystal into three regions. If there are P-type regions with hole conduction on both sides and N-type regions with electron conduction in the middle, we call it a P-N-P transistor. Conversely, if there are N-type regions on both sides and P-type regions in the middle, we call it an N-P-N transistor. The three regions of a transistor, according to their different functions, are called the emitter region, the base region, and the collector region. They are the three electrodes of the transistor, called the emitter, the base, and the collector. For convenience, it is often represented by the Latin letters e, b, and c.diode

The working principle of a transistor can basically be explained by its amplification effect. Because the amplification principle is the foundation of all transistor operations.diode