6/14/2023 0 Comments Download transistor as a switch![]() Some are interfacing large current or high voltage devices such as motors, relay or lamps. The Base input terminal must be made more positive than the emitter in order for the Base current to flow.Ī wide variety of applications are using transistor switches. The basic NPN transistor switching circuit is similar to the Common Emitter circuit with the difference of turning the transistor fully OFF or fully ON. ![]() It is also possible to use an NPN transistor if a positive ground configuration is needed. The resistor ensures that the base of the transistor does not go slightly negative which cause a very small amount of collector current to flow. To ensure that the transistor switch is completely turned OFF, R2 is used in the circuit below. To guarantee our transistor switch is always saturated, it is best to calculate about 30% more current than we will need in actual practice. Getting the transistor in a saturation state is the secret to making a transistor switch work properly. The PNP variety is the cost commonly used transistor switch as shown below.
0 Comments
Leave a Reply. |