Basic Electronics (ME223)

Zener diode is a voltage regulator device because it is able to fix the output voltage at a constant value (DC voltage).  RS is to limit the zener current, IZ so that it is less than the maximum current, IZM (to avoid the zener diode from broken).

A diode is used to pass current in a single direction. Alternating current is a current which flows in both directions. In some applications we need dc (direct current) power supply. A method to obtain dc supply is by using batteries. But it is not economical at all times. It is possible to obtain dc from ac supply .That process is known as rectification. Rectification is of two types: 1. Half wave rectification 2. Full wave rectification

Definition of Diode Current and Voltage • Forward Bias •When ID > 0mA and VD > 0V • Reverse Bias •When ID < 0mA and VD < 0V

Definition of Diode Current and Voltage • Forward Bias •When ID > 0mA and VD > 0V • Reverse Bias •When ID < 0mA and VD < 0V

Definition of Diode Current and Voltage • Forward Bias •When ID > 0mA and VD > 0V • Reverse Bias •When ID < 0mA and VD < 0V

An equivalent circuit is nothing but a combination of elements that best represents the actual terminal characteristics of the device. In simple language, it simply means the diode in the circuit can be replaced by other elements without severely affecting the behavior of circuit. The diode can be modeled in three different ways depending on the accuracy required.