Demonstration of Electrical Noise

Description

Electrical noise may be defined as any undesired voltages or currents that ultimately end up appearing in the receiver output. To the listener, this electrical noise often manifests itself as static. It may only be annoying, such as an occasional burst of static, or continuous and of such amplitude that the desired information is obliterated.

Also, we can say that noise is an unwanted electrical signal which distorts the original signal. Demonstration of Electrical Noise is present everywhere if there is some finite temperature. All types of noise should be minimized.

Here in this circuit, we are trying to demonstrate the noise signal present around us. If we touch the base of the transistor with our hand, then we can see that the LED starts blinking. Clearly, there must be some voltage arising at the base as soon as we touch it, this is the noise present in our body. It is in the form of voltage and it is in the range of microvolts.