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Tunnel Diode

Posted on : Sun , 03 2014 by : virusi


Tunnel Diode construction : Tunnel Diode or Esaki Diode is the p-n junction device that exhibits negative resistance. That means when the voltage is increased the current the current through it decreases. Fig.1 Tunnel Diode Tunneling is an effect that is caused by quantum mechanical effects when electrons pass through a potenti...

Zener Diode

Posted on : Sun , 03 2014 by : virusi


Theory OF OPERATION : Zener Diode construction : Zener Diode or “Breakdown Diode” operates like an ordinary diode in the forward bias direction. They have the normal turn on voltage of 0.6 volts for a silicon diode. However in the reverse direction their operation is rather different. Fig.1 Zener Diode To differentiate a Ze...


Posted on : Sun , 03 2014 by : virusi


Theory OF OPERATION : Diode construction : A PN Junction Diode is one of the simplest semiconductor devices around, and which has the characteristic of passing current in only one direction. However, unlike a resistor, a diode does not behave linearly with respect to the applied voltage as the diode has an exponential current-voltage (...

Light Emitting Diodes

Posted on : Sun , 03 2014 by : virusi


Theory OF OPERATION : LED construction : Light Emitting Diodes or LED´s is basically just a specialized type of PN junction diode, made from a very thin layer of fairly heavily doped semiconductor material. Fig.1 Led Construction When the diode is forward biased, electrons(K) from the semiconductors conduction band recombine w...

Capacitor in Parallel

Posted on : Sun , 01 2014 by : virusi


Theory of operation : Capacitors that are connected in parallel can be considered as a bigger capacitor because capacitance of all capacitors that are connected in parallel are summed. So adding capacitor in parallel will increase the space available to store charge and will therefore increase the total capacitance. \large Q_{Total} =...

Capacitors in Series

Posted on : Sun , 01 2014 by : virusi


Theory of operation : In series capacitors will each have the same amount of charge stored on them because the charge from the first one travels to the second one and so on. Fig.1 Capacitors in series The voltage of the circuit is spread out amongst the capacitors (so each capacitor gets a potion of the total voltage). \large V_{T} ...


Posted on : Sat , 01 2014 by : virusi


Capacitors, in particular, are essential in nearly every circuit application. They are used for waveform generation, filtering, and blocking and bypass applications. Some historical data : In October 1745, Ewald Georg von Kleist of Pomerania in Germany found that charge could be stored by connecting a high-voltage electrostatic generator b...

Resistors in parallel

Posted on : Sat , 01 2014 by : virusi


Theory of operation : When designing we very often use resistors therefore it is very useful to have a set of rules for finding the equivalent resistance. The circuit below shows the parallel connection of the resistors and the direction of the current. Fig .1 Resistors in parallel Fig .2 Another connection of resistors in paral...

Resistors in series

Posted on : Wed , 01 2014 by : virusi


Theory on resistor in series : Practical circuits often contain very complicated combinations of resistors therefore it is very useful to have a set of rules for finding the equivalent resistance of some general arrangement of resistors. The circuit below shows the series connection of the resistors and the direction of the current. Fig ....

Voltage and Current

Posted on : Fri , 01 2014 by : virusi


There are two Quantities that we like to keep track of in electronic circuits: voltage and current. These are usually changing with time; otherwise nothing interesting is happening. Theory on Voltage : Voltage (symbol V which stands for Volts or sometimes E which stands for electromotive force (EMF)) is the difference in charge between two p...


Posted on : Sat , 12 2013 by : virusi


Some Historical Data : Georg Simon Ohm was born on March 16, 1789 in the city of Erlangen in Bavaria, which is now Germany. He died on July 6, 1854 in Munich, Bavaria, Germany. Ohm came from a protestant family. Although his parents had not been formally educated, Ohm's father was a rather remarkable man who had educated himself to a high leve...

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