Stereo headphone is important components of audio equipment. It has a wide frequency response, low distortion, power saving, strong audio resolution, clear surround sound, and good music rhythm. Stereo headphone is divided into earphone and headphone, which has the difference of left and right channels. It cannot be used interchangeably. Otherwise, the fidelity of the sound source and the resolution of the source frequency will be directly affected.
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Method and steps
1 Write the desired words on the MDF with copy paper, leave 5cm on each side, use the manual engraving machine to install the corresponding straight knife, and open the mold along the outer line of the word (internal walking line, other outside line). After the mold is opened, the mold is flattened with a file. Then use the trowel and sandpaper to grind the sides and corners of the word's yin and yang mold into an arc shape, be sure to be smooth and even, and finally smooth with sandpaper. You can also use the computer engraving machine to engrave the mold, add enough height and then handle the roundness with high angle.
2 The production requirements of the bottom plate, the four sides of the male mold of the bottom plate should be smooth and the four corners should be ground into a circular arc and the inclination (that is, the width and width of the four corners) to facilitate demolding. The bottom of the bottom mold of the bottom plate can be ground with sandpaper, and the angle should not be too large, so that the gap between the two bottom plates can be reduced. Calculation Method for Acrylic Lightbox Floor Mold The calculation method for the acrylic light box bottom mold has two cases. The two algorithms are for aliquoting the bottom plate of several pieces.
3 The algorithm for dividing the mold into several blocks horizontally or vertically is as follows: subtract the size of the left side of the bottom plate with the total length equal to the total length of the mold to be made. Divide the total length of the mold to be divided by the equal division. The number of blocks is equal to the size of the bottom plate mold to be used. The total width is reduced by the size of the left side of the bottom plate. The size of the bottom plate is equal to the size of the bottom plate. The calculated size is reduced by 5 mm, which is the loss of the gap when the two bottom plates are spliced ​​(that is, The length of the final splicing) is the length of the final total size, which is obtained by splicing together the formed acrylic base plates on both sides of the bottom plate.
4 First, there must be a literal engraving, draw the bottom shell around the surface of the iron, and then enclose the word edge strip, solder the bottom shell, and arrange the LED module in the bottom shell! ! Connected out! Fasten the enclosing surface to the bottom case, and insert the hole with the screw
4 The positive connection of each string of lamps is welded in parallel with a long red wire, and the negative connection is welded in parallel with a long black wire. Connect the red wire to the positive pole of the dedicated 5v or 12V power supply for LED. The black wire is connected to the negative pole of the led 5v or 12V power supply (the positive and negative poles cannot be reversed). The sealant fixes the LED to the iron sheet. Test aging: After connecting, turn on the power. Check that the treatment is not bright, and then carry out the aging test for 24 to 48 hours.
Precautions
Acrylic floor and the cooling problem of the acrylic word. Depending on the physical properties of the acrylic sheet, the optimum cooling time is 24 hours and it takes at least 12 hours to use. The cooling method of the acrylic bottom plate: after the acrylic bottom plate is taken out from the platform, the bottom of the four sides is reversed and padded with a bracket, so that the bottom plate is not allowed to let the acrylic floor surface touch the ground. The middle part of the upper part of the four sides of the acrylic bottom plate is compacted with a heavy object, and then the surface of the acrylic dusting gun is used to gently press the surface, and the reversed surface is rapidly cooled and shaped. It can be used after pressing for a while. The cooling method of the acrylic word: After the acrylic word is taken out from the platform, it is placed in a flat place, and the four sides are pressed with heavy objects to prevent the bottom deformation.
The thickness of the acrylic sheet is suitable for the large size of the acrylic light box bottom plate, and the three thick plates are only suitable for the acrylic light box bottom plate of about 1 meter. If the area is too large, it should take into account the physical properties such as the load-bearing capacity, the stretchability and the tensile force of the sheet. 4-5 thick sheets can be selected depending on the local weather conditions and the size of the wind.
It is to see where there is any leaking light. The above is the identification method of the blister letters. Just look at the color difference. There is also uniformity of brightness. And the quality of the LEDs you buy. From the light fade, the brightness usually begins to weaken after about two years. The longer the time, the worse the brightness. However, the general advertising luminous word, the brightness of the LED is enough time. Unless it is what you ask for. Then the price is very high. 
The LED luminous word is a luminous font made by using a light-emitting diode as a light source. Led can save a lot of power to the country and users, saving a lot of man-hours for the contractor. The development of LED application technology has added new vitality to the highly competitive advertising industry. Its unique and different lighting situation is widely used in the production of advertising products. Different specifications of LEDs have different illumination angles and different brightness. Semiconductor ultra-high brightness light-emitting diodes (LEDs), especially nitride white light-emitting diodes, have the advantages of small size, low voltage, long life, fast response, no stroboscopic, low energy consumption, low heat generation, etc., and are gradually becoming a new generation of green. Energy-saving, environmentally friendly, long-life lighting source.