Led energy-saving lamp welding process, often encountered how to identify the positive and negative of the LED, this is especially important, the light is not bright on him!
The most common method is the multimeter detection method. When using a multimeter to detect LEDs, you must use the “R×l0k†file. The tube voltage drop of the LED is about 3V, and the multimeter is in the "R × lk" and below. The battery inside the watch is only 1.5V. Below the tube pressure drop. Regardless of the forward and reverse access, the LED is unlikely to be turned on and cannot be detected. The “R×1k†file is connected to a 9V (or 15V) high-voltage battery, which is higher than the tube voltage drop, so it can be used to detect LEDs. During the detection, the two test leads are respectively connected with the two leads of the light-emitting diode, such as the deflection of the hands half, and there is a bright spot in the light-emitting diode, indicating that the light-emitting diode is forward-connected, and the black test pen (with the battery in the table) The positive electrode is connected to the positive electrode; the negative electrode is connected to the red test pen (connected to the negative electrode of the battery in the watch). Then adjust the two test leads and connect them with the LEDs. In this case, the reverse direction is applied and the hands should not move. If the hands are deflected to the head or not moving, either forward or reverse, the LED is damaged.
Judging the straw cap LED positive and negative
Straw hat led positive and negative are relatively good to distinguish, or use the simplest method.
We can easily see the two block-shaped pins inside the LED. We call it the led bracket. The negative bracket is relatively large. The reason is that the negative bracket holds the led chip, and the positive bracket is relatively small!
So we came to the conclusion: "Visual inspection, inside the led, the pin of the large connection of the bracket is the negative pole, and the pin of the small link of the bracket is the positive pole"
Another simple method is that if your LED is a relatively new one and the pins are still sound, you can directly distinguish the length of the pins and you can separate the "positive pins are longer".
In fact, there are still many ways to detect led positive and negative, the way to compare cattle is to use a multimeter.
Judging 5050 SMD LED positive and negative
5050 patch led is a commonly used patch led in the LED energy-saving lighting industry, but many users get 5050 patch led do not know how to solder, the reason is not know how to distinguish 5050 patch led positive and negative Today, we will tell you how to distinguish 5050 SMD led positive and negative, we use the form of pictures, intuitively introduced to everyone, I hope to be useful to everyone!
The whole 5050 patch led is square, and one of the four right angles has a small corner, which is the place of the small circle. The other right angles have no small corners, the end with a small corner is the negative pole, and the other end is positive electrode!
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Any color of plastic is available to produce but in big quantity. Its
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