![]() Note down the deflection of multimeter.Condition 1: Connect RED probe to anode, BLACK probe to cathode.Procedure to check the condition of diode and go no-go condition Procedure to check the diode for faulty or OK condition Refer the following diagram for connections.And the terminal connected to BLACK probe is cathode.Now if the multimeter deflects, the terminal connected to RED probe is anode.If the multimeter DOES NOT DEFLECT, reverse the probes connections.Connect two probes to two terminals of diode, AT RANDOM.RED probe is positive and BLACK probe is negative.Take a multimeter and put it in ohmmeter range.So to check the diode there are two procedures as discussed below. When you pick up a diode from your stock, sometimes the cathode marking band on the body of diode, may be wiped out, so its difficult to find our the anode and cathode just by looking at it.Īlso when you are troubleshooting an electronic circuit, like a TV, DVD player, etc., and if you doubt a particular diode in the circuit, then after de-soldering it, you need to check it for its go no-go condition. How to find out the anode & cathode using a multimeter?ĭiodes are very cheap in cost, so it is a general thing that every electronic hobbyist has large number of diodes in his/her stock.What is Forward & Reverse Biasing of PN Junction?.What is Conductor, insulator & semiconductor?. ![]() 12th Standard Computer Science Downloads.12th Standard Computer Science Notes Paper-1 & Paper-2.12th Standard Electronics HSC Board Paper Solutions (Paper-1).12th Standard Electronics Solved Unsolved Problems Booklet Paper-1.12th Electronics Practical Booklets Paper-1 & 2.12th Standard Applied & Digital Electronics Notes Paper-1 & 2.12th Standard Digital Electronics Notes Paper-2.12th Standard Applied Electronics Notes Paper-1.The semiconductor diode has most of the same functions as the older vacuum diode, but it operates much more efficiently and takes up much less space than does a vacuum diode. ![]() ![]() In this sense, the n-semiconductor corresponds to the cathode and the p-semiconductor to the plate in the vacuum tube diode. The current is able to flow from the n-semiconductor to the p-semiconductor, but not in the other direction. P-type semiconductors contain small impurities that provide an excess of positively charged "holes" capable of moving through the system.Ī semiconductor diode is made by joining an n-type semiconductor with a p-type semiconductor through an external circuit containing a source of electrical current. N-type semiconductors contain small impurities that provide an excess of electrons with the capability of moving through a system. Newer types of diodes are made from n-type semi-conductors and p-type semiconductors. But alternating current fed into a diode can move in one direction only, thereby converting the current to a one-way or direct current. Alternating current is current that flows first in one direction and then the other. One use of such a device is to transform alternating current to direct current. ![]() Thus, the diode acts as a rectifier, allowing the flow of electrons in only one direction, from cathode to plate. If the plate is negative compared to the cathode, however, electrons are repelled and there is no electrical current from cathode to plate. If the metal plate is maintained at a positive potential difference compared to the cathode, electrons will flow from the cathode to the plate. As the cathode glows, it emits electrons. The cathode is also attached to a heater, which when turned on, causes the cathode to glow. The cathode and plate are sealed inside a glass tube from which all air is removed. Surrounding the cathode or placed at some distance from it is a metal plate. The working element in a vacuum tube diode is a metal wire or cylinder known as the cathode. ![]()
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