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I. Types of Diodes• Small and Large Signal Diodes• Zener diodes• Light-Emitting diode (LED)• Photodiodes• Schottky Diode• Shockley diode• Step recovery diode• Tunnel diode• Varactor diode• LASER Diode• Transient Voltage Suppression Diode• Gold Doped Diode• Super Barrier Diode• Peltier Diode• Crystal Diode• Avalanche Diode• Silicon Controlled Diode• Vacuum Diode• PIN Diode• Gunn DiodeII. Rectifier CircuitsThere are three(3) types of rectifier circuits namely, Center-Tapped Transformer, Half-Wave and Full-Wave Bridge Rectifier Circuit. Figure 1 shows the half- wave rectifier circuit where in the positive half-cycle’s waveform is shown. In figure 2 it shows the behavior of the negative half-cycle. In figure 3, the circuit is shown as an example of a full-wave bridge rectifier circuit. It also shows the current path and the behavior of the waveform in the positive half-cycle. In figure 4, it shows the negative half-cycle of the circuit and its current path.Figure 1. Half-Wave Rectifier Circuit, Positive Half-CycleFigure 2. Half-Wave Rectifier Circuit, Negative Half-CycleFigure 3. Full-wave Bridge Rectifier Circuit, Current Path in Positive Half-CycleFigure 4. Full-wave Bridge Rectifier Circuit, Current Path in Negative Half-CycleIn figure 5, it shows the center-tapped transformer circuit. It is an example of a full-wave rectifier circuit. It requires only two diodes and a center-tapped transformer to produce an input signal on the secondary of the transformer. In figure 6a, it shows the waveform of the positive half-cycle and figure 6b, shows the negative half-cycle. Figure 5. Center-Tapped Transformer Rectifier CircuitFigure 6a. Waveform of positive Half-Cycle Figure 6b. Waveform of negative Half-cycleIII. Block Diagram Of Power SupplyIn figure 7, it shows the block diagram of a power supply with its waveforms shown in each block to see how the waveform looks like in the process. In the first process where in an input AC signal goes to the transformer. The transformer’s role is to step-down the AC signal into a small signal. It is then the step-down value goes to the rectifier bridge where in the signal will be rectified, in this case it is a half-wave rectification. After it has been rectified, the capacitors filter the signals making the waveform almost linear, but if the signal is magnified the waveform has ripple voltages. Lastly the regulator, regulates the output voltage where in only the desired output voltage is produced and we can see a DC signal output. Figure 7. Block Diagram of Power SupplyIV. Applications of DiodesDemodulation of Signals is an application of diodes. It uses diodes in removing negative components within an AC signal. An example of this application is a filtering system in radios where it extracts radio signal from the carrier wave. Another application is the Current Steering.  It uses diodes to steer the current to flow in its proper direction. An example of this application is the uninterruptable power supply where in if the power source is removed, the battery will power the device without the user noticing the interruption.V. ReferencesBoylestad, R., & Nashelsky, L. (2013). Electronic Devices and Circuit Theory. New York: Pearson.Burris, M. (2017, November 29). Applications of Diodes. Retrieved from Lifewire: https://www.lifewire.com/applications-of-diodes-818815Electronics Area. (2017, November 29). Basic Power Supply Block Diagram. Retrieved from Electronics Area: https://electronicsarea.com/basic-power-supply-block-diagram/Electronics Hub. (2017, November 29). Types of Diodes . Retrieved from Electronics Hub: http://www.electronicshub.org/types-of-diodes/

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