The use of LED flexible light bars LED strip lighting is mainly used for decorative purposes. As the LED strip is not very well understood, there are many customers who will miss some links in the calculation of the project quotation, giving themselves some extra unnecessary costs. The following is an example of some products to share how to calculate the project installation cost of LED strip lights: 1, LED strip length: calculate the total length of the required LED strip. LED strip can be divided into three groups of cut off the use of the general 60 LED per meter LED strip length of 50mm per group, 30 LED per meter LED strip length of 100mm per group. understand this can be calculated according to the construction effect design drawings the actual need to use The number of LED strips to be used. Generally set aside about a meter of spare length is good, so as to avoid excessive procurement resulting in a waste of resources.      2, LED strip power: because the purchase of LED strip does not distribute power, so after calculating the length of the required LED strip, to calculate the power required to match the power supply. The power of different LED strips varies, so the power of the matching power supply should be chosen with care. The following is a list of LED strip power: 0603LED strip: 12V, 60 LEDs per metre, 1.5W per metre 1210LED strip: 12V, 60 LEDs per metre, 4.8W per metre 5050LED Flexible Strip: 12V, 30 LEDs per meter, 7.2W per meter 5050 LED strip light: 12V, 60 LEDs per meter, 14.4W per meter        For example, if you buy a 5050 LED strip with a 12V, 4A power supply, you can only take 6 metres of 5050 LED strip with one power supply. Because the power of 5050LED strip is 7.2W per metre, the total power of 6 metres is 43.2W, while the rated power of the power supply is 48W. It is generally not recommended to use the power supply at full capacity, as this has a great impact on the life of the power supply. If you need 100 meters, then the corresponding 4A power supply will need to be equipped with * less than 16.    3, LED soft strip controller: for RGB soft strip, it must be equipped with a controller to be effective, and a controller can control the length of the LED soft strip from 5 meters to 20 meters, mainly depending on which specification of controller is chosen. Thus, after purchasing the RGB strip, you will also need to purchase additional controllers depending on the length of the controller, or additional RGB amplifiers (each amplifier can be extended by 5 metres). Do not make the mistake of thinking that one controller can achieve all the control requirements of an RGB soft strip, this is a misconception.        Let's say you buy a 100m RGB strip and the controller you choose is a conventional controller, i.e. each controller has a 5m control range. Then a 100m RGB strip would require 20 RGB controllers, or one RGB controller and 19 amplifiers.

Design process and steps for efficient automatic PCB routing Currently, in order to understand the difficulties in pcb decision design and to speed up product launches, many manufacturers now tend to use dedicated EDA tools to implement PCB design. However, dedicated EDA tools do not produce the desired results, nor do they achieve 100% cloth throughput, and are messy and usually take a lot of time to complete the rest of the work.　　 How can PCB design be better achieved with these tools? Careful analysis of the design and careful set-up of the tool software before you start routing will make the design more compliant. The following is the general design process and steps. 　　 1, determine the number of layers of the PCB　　 The size of the board and the number of layers to be wired need to be determined early in the design. If the design requires the use of high-density ball grid array (BGA) components, it is necessary to consider the minimum number of layers of wiring required to route these devices. The number of layers and the stack-up method have a direct impact on the wiring and impedance of the printed lines. The size of the board helps to determine the stack-up method and the width of the printed lines to achieve the desired design result.　 2. Design rules and limitations　　 The automatic wiring tool itself does not know what to do. In order to complete the wiring task, the wiring tool needs to work within the correct rules and constraints. Different signal lines have different wiring requirements. All special requirements should be classified and different design categories should be classified differently. Each signal class should have a priority, and the higher the priority, the stricter the rules. Rules relating to printed wire width, maximum number of vias, parallelism, interaction between signal lines and layer limitations have a significant impact on the performance of the wiring tool. Careful consideration of the design rules is an important step towards successful wiring.　　 3. Layout of components　　 To optimise the assembly process, Design for Manufacturability (DFM) rules can place restrictions on component layout. If the assembly department allows for component movement, the circuit can be optimised appropriately and more easily wired automatically. The rules and constraints defined influence the layout design.　　 Routingchannels and vias need to be considered during layout. These paths and areas are obvious to the designer, but the automatic routing tool will only consider one signal at a time. By setting the routing constraints and setting the layers on which the signal lines can be laid, the routing tool can do what the designer envisages.　 4. Fan-out design　　 In the fan-out design phase, to enable the autowiring tool to make connections to the component pins, each pin of the surface mount device should have at least one vias so that the board can be internally connected, in-circuit tested (ICT) and the circuit reprocessed if more connections are required.　　 For the most efficient automatic routing tool, always use the largest possible over-hole size and printed lines, with a spacing setting of 50 mil being ideal. Use the type of vias that allow for the largest number of wiring paths*. 5. Manual wiring and the handling of critical signals　　 Manual routing is and will continue to be an important process in printed circuit board design. The use of manual routing helps the automatic routing tools to complete the routing work. By manually routing the selected network (net) and fixing it, a path can be formed that can be used as a basis for automatic routing.　　 Regardless of the number of critical signals, they are first routed, either manually or in combination with an automatic routing tool. Critical signals often require careful circuit design to achieve the desired performance. Once the wiring has been completed, it is then checked by the relevant engineering staff, which is a much easier process. Once the check has been passed, these wires are fixed and the automatic wiring of the remaining signals begins.　 6. Automatic wiring　　 Wiring critical signals requires consideration of electrical parameters to be controlled during wiring, such as reducing distributed inductance and EMC, and similarly for other signals. All EDA vendors provide a method to control these parameters. With an understanding of what input parameters are available to the autowiring tool and how they affect the wiring, the quality of the autowiring can be assured to a certain extent.　　 Generic rules should be used for automatic routing of signals. By setting restrictions and no-wiring zones to limit the layers used for a given signal and the number of vias used, the wiring tool can automatically route the signal according to the engineer's design ideas. 7. Wiring organisation　　 If the EDA tool software you are using is able to list the wiring lengths of signals and examine this data, you may find that some signals with few

For SMT Operators Once an operator asked the smt bonder bonder required air pressure In fact, strictly speaking smt bonder voltage is different, but generally speaking 0.5-0.6 can be, using 380v three-phase five-wire AC industrial frequency power supply. In general, the Universal bonder, Siemens bonder and other equipment, the required air pressure to be higher. The quality and speed of the mounting is also relatively good. This is common knowledge, so smt operators should have more knowledge of the industry. The best advice is to attend a training course provided by the equipment manufacturer. This training is generally divided into different levels. For example, maintenance and repair and maintenance level 2, etc. As an equipment technician, it is sufficient to attend such training. If you are a process technician, you will need to attend programming training, as this includes a lot of process knowledge. This training varies depending on the grade of the equipment manufacturer. Some equipment manufacturers offer more specialised training, for example Siemens, Panasonic and Fuji are very specialised.

Explanation of feeder for SMT machine If you are in the SMT industry, you will often see the term "feeder", which is generally translated as feeder or feeder, but also called feeder (but this name is less used in the SMT industry). For example, it's like adding feed to a chicken's food box as you would normally see. The role of the SMD flyer is to mount the SMD components on the feeder, which provides the components for the mounter to mount. For example, there is a PCB on the need to mount 100 kinds of components, then you need 100 feeders to install components for the bonder feed. So how to classify the bonder feeder? 1. According to the machine brand and model distinction . Generally speaking, different brands of bonder use different feeders, but different models of the same brand can generally be common. 2. According to the package size and type of components with the distinction.    Types are generally 4 kinds       1. tape mounted       2. tube mounted       3. trays (also known as waffle trays)       4. bulk    The banding will be differentiated by the size of the banding       8 mm, 16 mm, 24 mm, 32 mm, etc. 3. According to the original and imitation distinction       The original is the original bonder manufacturer's production       Due to the high demand for bonder feeders, there are currently many imitation feeders in China. The quality of some of them is also very good.

The influence of feeder and nozzle on smt mounter placement The influence of the feeder is manifested as the abnormality of the feeder. The drive way of the feeder has the motor drive, the mechanical type drive as well as the cylinder drive and so on several kinds, here takes the mechanical type drive as an example, illustrates the influence of the feeder to the smt mounter placement rate:: 1, drive part wear and tear The mechanical type drive relies on the cam spindle to drive the feeder mechanism, quickly knocks to find the feeder strikes to find the arm, through the connecting rod to make the ratchet wheel connected with it drives the component braid to advance an incoming distance, at the same time drives the plastic roll tape plate to braid the plastic tape cap away, the suction nozzle drops to finish taking the piece action. However, due to the high speed of the feeding mechanism to access the feeder, after a long time of use, the pawl of the feeder is seriously worn, causing the pawl can not drive the tape reel plastic tape normal stripping, so that the suction nozzle can not complete the work of taking pieces. Therefore, before installing the braided tape should carefully check the feeder, the pawl wheel has worn feeder should be repaired immediately, can not be repaired should be replaced in a timely manner. 2、Deformation of structural parts of feeder Due to long-term use or improper operation of the operator, its pressure belt cover plate, thimble, spring and other movement mechanism deformation, rust, etc., which leads to device absorption bias, vertical piece or can not absorb the device, so should be regularly checked, found the problem in time to deal with, so as not to cause a lot of waste of the device, at the same time in the installation of a total of material should be correctly, firmly installed in the supply department platform, especially no feeder height detection of equipment, otherwise it may cause the feeder or feeder. Otherwise, it may cause damage to the feeder or equipment. 3、Bad lubrication of the feeder The general maintenance and upkeep of the feeder is easily ignored, but regular cleaning, washing and oil lubrication is an essential task. The influence of the suction nozzle suction nozzle is also affect smt placement machine placement rate another important factor, cause the reason has the internal reason, also has the external reason 1、Internal reason On the one hand is the vacuum negative pressure is insufficient, suction nozzle takes the piece before automatically converts the mechanical valve on the mount head, converts from blowing to true it adsorbs, produces the certain negative pressure, when absorbs the part after, the negative pressure sensor detects the value within a certain range, the machine is normal, on the contrary suction is **. On the other hand is the filter on the mounting head and the filter on the suction nozzle because of the surrounding environment or the air source is not pure is polluted and blocked and black. Therefore the filter should be replaced regularly, the filter on the general suction nozzle should be replaced at least once in half a month, the filter on the mounting head should be replaced at least once in half a year, in order to ensure the smooth airflow. 2、External reason On the one hand is the air source circuit pressure relief, such as rubber air tube aging, rupture, seal aging, wear and tear as well as suction nozzle after long time use, etc., on the other hand is because of the adhesive or the dust in the external environment, especially the paper braided tape packaging components in cut off after a large number of waste chips, cause suction nozzle plugging, therefore because daily check the cleanliness of the suction nozzle, monitor and control the suction nozzle at any time to take the pieces, to block or take the pieces bad The nozzles should be cleaned or replaced in time to ensure good condition. At the same time, when installing the nozzles, correct and firm installation must be ensured, otherwise damage to the nozzles or equipment will result.