Transistor PNP 2n2907 TO-92

Description

The transistor is a circuit element that can be used as an electrically operated switch. It is made of semiconductor materials, has three terminals and can interrupt or close the circuit between two terminals depending on the control applied to the control pin. 

Use with Arduino

There are two common types of transistors: bipolar and field effect.

                                  Bipolar transistors

The image shows the bipolar transistor symbol (left) and an illustration of a universal transistor (right). There are two types of transistors: NPN and PNP (depending on the type of semiconductor material). Its terminals are: B - Base C - Collector E - Emitter.

                                      MOS transistors

The base will be used to control the transistor. Initially, it will not drive the current (between C and E). If the base-emitter voltage exceeds an opening threshold (about 0.65 V), it will absorb the current through the base and let it pass (almost) freely between C and E. The image shows the equivalent symbols of field effect transistors (FET - Field Effect Transistor). They behave similarly with one exception: they do not absorb energy constantly after they are open (unlike the bipolar transistor). Toggle faster, but their disadvantage is that for the command, a higher voltage is required on Gate (Gate) - 1.8 ~ 10 V.

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