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\"Fully updated coverage of PCB design and construction with EAGLE. This thoroughly revised, easy-to-follow guide shows, step-by-step, how to create your own professional-quality PCBs using the latest versions of EAGLE. Make your own PCBs with Eagle: from schematic designs to finished boards, Second Edition, guides you through the process of a developing a schematic, transforming it into a PCB layout, and submitting Gerber files to a manufacturing service to fabricate your finished board. Four brand-new chapters contain advanced techniques, tips, and features. Downloadable DIY projects include a sound level meter, Arduino shield, Raspberry Pi expansion board, and more!\"--Page 4 of cover.

Microfluidic systems are rapidly becoming commonplace tools for high-precision materials synthesis, biochemical sample preparation, and biophysical analysis. Typically, microfluidic systems are constructed in monolithic form by means of microfabrication and, increasingly, by additive techniques. These methods restrict the design and assembly of truly complex systems by placing unnecessary emphasis on complete functional integration of operational elements in a planar environment. Here, we present a solution based on discrete elements that liberates designers to build large-scale microfluidic systems in three dimensions that are modular, diverse, and predictable by simple network analysis techniques. We develop a sample library of standardized components and connectors manufactured using stereolithography. We predict and validate the flow characteristics of these individual components to design and construct a tunable concentration gradient generator with a scalable number of parallel outputs. We show that these systems are rapidly reconfigurable by constructing three variations of a device for generating monodisperse microdroplets in two distinct size regimes and in a high-throughput mode by simple replacement of emulsifier subcircuits. Finally, we demonstrate the capability for active process monitoring by constructing an optical sensing element for detecting water droplets in a fluorocarbon stream and quantifying their size and frequency. By moving away from large-scale integration toward standardized discrete elements, we demonstrate the potential to reduce the practice of designing and assembling complex 3D microfluidic circuits to a methodology comparable to that found in the electronics industry. Significance Microfluidic systems promise to improve the analysis and synthesis of materials, biological or otherwise, by lowering the required volume of fluid samples, offering a tightly controlled fluid-handling environment, and simultaneously integrating various chemical processes. To build these systems, designers depend on microfabrication techniques that restrict them to arranging their designs in two dimensions and completely fabricating their design in a single step. This study introduces modular, reconfigurable components containing fluidic and sensor elements adaptable to many different microfluidic circuits. These elements can be assembled to allow for 3D routing of channels. This assembly approach allows for the application of network analysis techniques like those used in classical electronic circuit design, facilitating the straightforward design of predictable flow systems.

Aerosol Jet Printing (AJP) is an emerging contactless direct write approach aimed at the production of fine features on a wide range of substrates. Originally developed for the manufacture of electronic circuitry, the technology has been explored for a range of applications, including, active and passive electronic components, actuators, sensors, as well as a variety of selective chemical and biological responses. Freeform deposition, coupled with a relatively large stand-off distance, is enabling researchers to produce devices with increased geometric complexity compared to conventional manufacturing or more commonly used direct write approaches. Wide material compatibility, high resolution and independence of orientation have provided novelty in a number of applications when AJP is conducted as a digitally driven approach for integrated manufacture. This overview of the technology will summarise the underlying principles of AJP, review applications of the technology and discuss the hurdles to more widespread industry adoption. Finally, this paper will hypothesise where gains may be realised through this assistive manufacturing process.

The ability to design and fabricate lightweight structure is one of the most important aspects for building a drone system. Often, connecting wires are used on the drone system for powering and signal transmission at the expense of the drone’s weight. In this paper, we explore the design and fabrication of a safety cage for drone using design optimization and 3D printing. A comparison between fused deposition modelling (FDM) and selective laser sintering (SLS) 3D printing techniques for the fabrication of thin structures was made, and it was found that SLS is more superior in this aspect. A hybrid 3D printing process combining SLS and aerosol jet printing is proposed for the fabrication of lightweight multifunctional structure with printed circuit for a drone safety cage. The safety cage is designed in such a way that maximizes the production efficiency of SLS printing process. In addition, aerosol jet printing is used to fabricate conformal circuit onto the 3D-printed safety cage structure to replace the conventional connecting wires for weight saving purpose. Lastly, an electrical characterization is conducted to investigate the functionality of the printed conductive traces on the safety cage. Nevertheless, this work demonstrates the streamlining of various 3D printing approaches for the fabrication of multifunctional structures with conformal circuits.

The high-frequency and high-speed printed circuit board (PCB) with lower transmission loss, higher heat resistance, and better processability play increasing significant roles in mobile communication technology. However, because the materials and micro drilling process of high-frequency and high-speed PCB are very different from the traditional printed board, there are still many of key techniques to be explored in the future study. In this paper, the characteristics of high-frequency and high-speed PCB were presented. Researches concerning the design and wear ability of micro drill, the analysis of micro drilling force and temperature, and the quality of micro holes were reviewed. Finally, several key techniques and challenges regarding materials and micro drilling were suggested.

The fourth industrial revolution, Industry 4.0, has been characterized by novel concepts introduction in manufacturing systems that enable smart factories with vertically and horizontally communication to improve their performance. Many virtual systems allow to predict foul conditions, save energy, study special cases, and so on, yet they need to implement new digital tools that allow developing manufacturing process in a better manner. As a result, Digital-Twin platforms are a good alternative since they are virtual models that could receive online and offline data. Thus, programmed algorithms can be evaluated to know the performance of the manufacturing process. These virtualizations and interconnections between elements of the manufacturing process become important components with an increasing role in dealing with supply, production times, and delivery chains as they run in parallel and find optimal performance before implementing these conditions into the real system. This study focuses on the use of a Digital-Twin that integrates a metaheuristic optimization and a direct Simulink model for printed circuit boards (PCB) design and processing focused on the drilling process. The results show that metaheuristic optimization can be integrated into the Digital-Twin concept as part of the production system into the drilling process. In the first part, it shows that depending on the penalization the optimization focuses on the lower path and forgets on changing the tools, yet as the penalization raises it focuses on finishing drilling with one tool before changing. Second, it is important where on the PCB it starts the drilling, with less time depending on each plaque. Third, it can be observed that using optimization can triple the amount of PCBs that can be manufactured. Finally, on an 8-hr run the Digital-Twin that didn’t use optimization can only work with three different designs, differently with optimization it can have 7-8 changes in the PCB design.

This study aims to investigate ultraviolet (UV) laser patterning QR codes on printed circuit boards (PCBs) for the inventory management of image recognition. The developed technology is a green manufacture and can replace the harmful environmental substances of brominated epoxy resin ink for the PCB process. In this study, the recognizability of the laser-patterned QR codes and the relationship between the ablated depth and the color change were investigated. The gray relational analysis (GRA) method was adopted to obtain the optimal laser patterning parameters. Furthermore, a spectrophotometer, scanning electron microscope, laser confocal microscope, and spectrometer were used to examine the light absorbance, the ablated depth, the pattern morphology, and the change in light reflectance of the laser-patterned QR codes on PCBs, respectively. The laser-patterned results revealed that QR codes produced white images with an ablation depth ranging from 5 to 10 μm as the scan speed was 300 mm/s at a laser power of 2 W and the scan speed was 900 mm/s at a laser power of 3—6 W. Moreover, the light reflectance of the white sample was close to 0.3819—0.3139, which was a parameter for successful whitening and was easy to recognize by a smartphone app. According to GRA results, the recognized QR code image could be patterned by the parameters of 2 W laser power, 300 mm/s scan speed, and 60 μm scan space. Furthermore, the scan speed was a severe impact factor for laser-patterned QR codes.

In-mold electronics (IME) is a novel manufacturing technology which combines printed electronics and film insert molding to produce electronics-integrated plastic components. Basically, the IME process includes printing, thermoforming, and injection molding. During the thermoforming process, the printed circuit undergoes deformation which results in a variation of the electrical resistance of the circuit, and, therefore, the thermoforming process is one of the important processes which determine the performance of the IME product. In this regard, this study aims to investigate the details of the resistance variation based on the deformation of the printed circuit during the thermoforming process. The deformation of the printed circuit is characterized experimentally and numerically, while a regression model is constructed to describe the relationship between deformation and electrical resistance of the circuit. Then, the electrical resistance distribution of the circuit after the thermoforming process is predicted based on the numerical results and the regression model, which is compared with experimental data. The effect of geometrical parameter is also investigated both experimentally and numerically.

Microholes serve as channels for signal connections between layers of printed circuit boards (PCBs). Excess copper in holes can compromise signal integrity, which is typically removed by backdrilling. However, as high-speed PCBs evolve toward miniaturization and high density, removing chips during backdrilling becomes more difficult, often leading to micro-hole plugging. This significantly impacts the performance of high-speed PCBs and can even result in product scraping. To address this issue, this paper investigates the chip removal mechanism during backdrilling of high-speed PCBs to prevent hole plugging. Firstly, a kinematics method is conducted to examine the mechanical behavior and motion law of chip formation, followed by the derivation of expressions for chip removal force and chip moving speed. A chip removal model is then established, along with an evaluation index of chip removal capability. The effects of machining parameters on chip removal efficiency are also analyzed. Finally, backdrilling experiments are carried out to observe the chips winding around the drill bit and measure the hole plugging rate. The experimental results demonstrate that as feed rate increases, the number and density of chips wound around the drill bit slightly decrease, while the hole plugging rate increases proportionally. However, increasing the spindle speed significantly reduces chip winding of tools, lowers hole plugging rates, and decreases the chip removal force during backdrilling. This research provides theoretical insights for overcoming the challenge of microhole plugging in the high-speed PCB industry.