Question

What is meant by?

Voltage stabilization: - A rectifier with an appropriate filter serves as a good source of D.C. output. However the major disadvantage of such a power supply is that the output voltage changes with the variation in the input voltage or load. In many electronic applications, it must remain constant, regardless of the variation in the input voltage or load. To ensure this, a voltage stabiliser has a Zener diode.

Filter choke: A filter circuit is a device which are removes the A.C. component of rectifier output, but allows the D.C. component to reach the load.

The filter choke or coil serves to maintain the current flow to the filter output (RL) at a nearly constant level during the charge and discharge periods of the filter capacitor.

Impedance: It can be expressed as the algebraic sum of the total resistance in a R - L, R - C, R - L - C Circuit. It is denoted by Symbol Z and is measured in ohms.

Rectification: - Conversion of AC to D.C. is called rectification. The modern rectifying device is a semi-conductor junction rectifier.

Grid bias voltage

The most important requirement of an amplifier is that it should do faithful amplification i.e. it should increase the magnitude of the signal but the general shape of the signal should not change

In order to achieve faithful amplification, the control grid of the amplifying tube should be kept at a positive potential with reference to cathode at all times

To do so, a D.C. voltage is applied to the grid circuit, in addition to signal voltage

This D.C. Voltage Is Known As Grid Bias Voltage