This presentation discusses different types of rectifier circuits. It begins with an introduction to rectifiers and their purpose of converting AC to DC. Then it covers the half wave rectifier, which uses one diode to pass current in only one direction each cycle, and its disadvantages of low output and ripple. Next, it describes the full wave rectifier using two diodes or a bridge configuration to pass current in the same direction over both halves of the cycle, doubling the output. Key details of the center tap and bridge rectifier circuits are provided along with comparisons of their advantages and disadvantages.