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Surge Protector Installation Best Approach

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Useful Application of diode

1. Using Diode to Drop output voltage
Because diodes are capable dropping a voltage of about 0.7v to get it to conduction zone. Because of this, they diodes can be added in series across a power supply in other to limit its output voltage by some fractions.










* The software I used was not clear enough, but I guess you will be able to see it.
 More diodes can also be added in series to drop the voltage to the desired level.

 According to the above example:
The supply voltage is 9V which was dropped to 7.6V by adding two diodes in series.
The simple calculation goes thus:
9V - (0.7 x 2)V = 7.6V
The 0.7V arise from the diode voltage drop.

 2. Circuit Protection
Electrical/electronics Projects got damaged when powered by a voltage of opposite polarity. Because of the ability of diodes to allow current flow in one direction only it can therefore be used as a circuit protector against wrong polarity when placed the proper way.
                                                                    Figure 1
With the circuit in figure, the polarity of the power supply is mistakenly connected with opposite polarity. With this, the opposite polarity of the power supply will damage the project.



                                                                 Figure 2
With the above figure 2 circuit mistakenly connected, the diode will block the flow of current through it and at the same time through the circuit. Therefore the circuit will just fail to come on until the right polarity of power supply is applied to the circuit.

Another Diode Wrong Polarity Protection

In this configuration, when the project is connected with the wrong polarity, the fuse will burn and the circuit will not come ON. One of the big advantage of this circuit is that the diode will not drop its usual 0.7V. Thus, allowing the project to have access to its require 12V(B2) supplied by the power supply.


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