LED small night light leds are negative discriminant method

< p > LED small night light during the welding process, often encounter how to identify the light emitting diode is negative, it is particularly important, the light is not bright as he! The most commonly used method is the multimeter test. When using a multimeter to detect light emitting diode, must use 'R x l0k' file. Trapped for light-emitting diode tube pressure drop is about 3 v, the multimeter in x lk 'R' and the following electrical block. Cells in the table is only 1. 5V。 Below the pipe pressure drop. Regardless of the positive and reverse access, light-emitting diodes (leds) is likely to conduction, also cannot detect. 'R x 1 k file table inscribed with 9 v ( Or 15 v) High voltage battery, higher than the pipe pressure drop, so can be used to detect light emitting diode. Test, two pens and respectively into the light-emitting diodes (leds) two fuses, whose hands deflection, such as more than half, at the same time there is a bright spot in light-emitting diodes, said light-emitting diode is forward access, then with black pens and ( Connected to the battery positive electrode in the table) Connect the anode; With the red pens and ( Connected to the battery cathode in the table) Following is the cathode. Again after two pens and switch into the light-emitting diodes (leds), at this time to reverse access, whose hands should not move. If no matter forward access or reverse access, whose hands are at the end of deflection or all motionless, then the light emitting diode is damaged. We it is not hard to see the led inside block two pins, we called the led bracket, including anode bracket is large, the reason is the cathode stent TuoZai led chips, the anode bracket is small! So we came to the conclusion is: 'visual, led inside, support pin connection is negative, support small link pin is the positive' there will be a relatively simple method is, if your led small night light is a relatively new, pins are sound, direct look at the length of the pins, can points out 'the positive pin longer. ' < / p > < p > light li specializing in the production of chaozhou LED3C light-activated small night light, welcome to consult < / p > < p > the article source: li 3 c electric light a night light ea - gl。 com

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