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With a range of technical indicators, referred to as diode parameters. Diodes of different types have different parameters. For starters, you must understand the following main parameters: 1, rated to work current refers to the diode long-term continuous working time allowed by the maximum forward current value. Because when the current through the tube causes the pipe core heating, temperature rise, temperature exceeds the allowed limit (silicon tube of about 140, germanium tubes for around 90 per cent), it will cause the core to overheat and damage. So, diode use do not exceed the diode rated to work in current value. For example, the commonly used IN4001-4007-germanium diode forward current rating of 1 a. 2, the maximum reverse voltage in diode reverse voltage on both sides of the high to a certain valhttp://www.topcheapchaneloutlet.comue, the tube breakdown, lost a one-way conduction capability. In order to ensure security, provided for a maximum reverse voltage value. For example, the IN4001 diode reverse voltage to 50V,IN4007 reverse voltage to 1000V. 3, reverse reverse currents means the diode under the prescribed temperature and maximum reverse voltage, reverse current flowing through the diode. Smaller reverse current, pipe one wizard better electricachanel handbagsl performance. Worthy of note is the reverse current and temperature there is a close relationship, about elevated temperature every 10, reverse current increases 1 time. For example 2AP1-germanium diodes, 25 o'clock if the reverse current is 250uA, the temperature to rise to 35 per cent, will rise to reverse current 500uA, and so on, at 75 o'clock, reverse current of 8mA it not only lost a single conductive properties, will also cause the pipes to overheat and damage. As another example, 2CP10 Silicon diodes, 25 o'clock only reverse current 5uA, temperature increases to 75 o'clock, reverse current, but also 160uA. Than Silicon diodes and germanium diodes with better stability at high temperature. Test the diode is good or bad Starter Kit under amateur conditions you can use a multimeter to test diode performance is good or bad. Test before switching to multimeter ohm RX1K stalls (be careful not to use the RX1, so as to avoid excessive current burned out diode), then red and black two probes short circuits, ohm zero. 1, is to test the black multimeter probes (cathode inside a table) taking of contact chanel onlinediode cathode, red table (table within the anode) taking of contact diode anode. If hands are not set to a value of 0, but stopped in the middle of the scale, when the resistance is the diode's forward resistance, positive resistance in general the smaller the better. Forward resistance of 0 value description core short circuit damage, if positive resistance value is close to infinity, note pipe core circuit breakers. Short circuit and open circuit pipes cannot be used. 2, reverse characteristics test table's red pen on the touch and the diode cathode, the black table pen on the touch the anode of the diode, handchanel outlets in infinite values or value is close to infinity, pipe is qualified. Applications of diode 1 one-way conduction using diode, Rectifier diodes, the AC can alternate directions transforms into a pulsating direct current of single direction. 2, switch components under diode forward voltage resistance is very small, in the on-State, the equivalent of a connected switch; under reverse voltage, resistance is large, is in the closing state, like a broken switch. Using diode switch characteristics, you can make up the various logic circuits. After 3, the diodes are limiting Component Wizard passes, it is the forward voltage drop remained unchanged (silica tube is 0.7V, germanium forms for 0.3V). Take advantage of this feature, as the limiting component in the circuit, you can limit the signal within a certain range. 4, after the current diode in the inductor in switching power supply and relay, inductive load, such as following the flow. 5, the detector diode detection role played on the radio. 6, variable capacitance diode for the TV tuner.