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A transistor is one of the most complex Semiconductor. It can both amplify and serve as a switch. Bipolar transistor has the function of command. If it receives a current on the basis, it will therefore pass current.
For the bipolar transistor, there are two kinds. The PNP and the NPN. PNP means positive, negative, positive. NPN means negative, positive and negative. The first letter designates the collector (C), second base (B) and the third the transmitter (E).
EBC letters on the data sheets of the components used to indicate the function of each of the three pins. The basis is always the pin that controls the transistor. When it sends the correct voltage control on the transistor. In addition, intensity applied on the basis amplifies the output intensity.
In a transistor, power will transfer from the collector to the transmitter. There are also aware of the basis coming out to the transmitter, but the current applied on the collector makes never at the base.
According to the transistor, you can order engines or more powerful lights with little current. Also, the advantage of the transistor, is that there are very fast. They can manage, at the base, several kHz frequencies. (According to the transistor)
Bipolar transistor are the 2N3904 (NPN) and the 2N3906 (PNP).