Techno Geek

Working of a  DIODE or Crystal Diode..... In a symbol of the diode, the arrowhead represents the direction of the conventional current Flow. A simple PN junction diode can be created by doping donor impurity to one part of the semiconductor and acceptor impurity to the other part of the semiconductor of silicon or germanium crystal blocks. The middle part of the Sandwich of these two semiconductors makes the PN junction beside which one part is the p-type semiconductor and the other is the n-type semiconductor.  In p-type it is doped with the trivalent or acceptor impurity. In n-type it is doped with the pentavalent or donor impurity. Hence it is a device with two elements Anode formed by p-type and Cathode formed by the n-type. These two terminals are used to make the external connections. UNBIASED DIODE: In n-side there are a significant number of electrons available and few holes these holes are due to the thermal excitation. In p-side, it will have t...

What is a Diode? A Diode is Device which can only allow current to flow in only one direction if it is operated within the specified level of voltage.  1.It is unidirectional Device. 2. It is made up of two semiconductors one is p-type semiconductor and another is n-type semiconductor. 3. In P-type semiconductor majority charge carriers are Holes & minority charge carrier are electrons  4. In N-type semiconductor majority charge carriers are electrons & minority charge carrier are electrons. 5. A P-N junction is the simplest form of the Diode which behaves as a short circuited when the diode is said to be forward biased 6. A P-N Junction diode behaves as a open circuit when it reverse biased. 7. A arrangement of a diode can convert AC to a  pulsating DC and so it is sometimes also called as a rectifier. 8.  Diode means DI + ODE which means a device which has two Electrodes and these Electrodes are nothing but Anode (A) and Cathode (K). ...