By Cyrille Lothaire. Electrical Wiring. Publised at Thursday, December 28th 2017, 05:00:05 AM. This PCB, like almost all of my PCBs, is a four-layer board. In my opinion, it is not wise to restrict yourself to two layers unless you’re dealing with a very simple circuit or you really need to cut costs. The four-layer arrangement is beneficial in terms of routing and performance: routing, because via connections to internal planes almost completely eliminate power and ground traces; and performance, because the internal planes allow for low-resistance, low-inductance power and ground connections. The extra top-layer and bottom-layer real estate opened up by all the internal-plane connections come in very handy when you need to provide a generous copper area for improved thermal performance (for example, to make sure that your LDO or your motor driver doesn’t overheat and enter thermal shutdown).
By Adrienne Emmanuel. Electrical Wiring. Published at Thursday, December 28th 2017, 21:36:39 PM. Typical fixtures have high-temperature resistance, good mechanical strength for precision machining, and good abrasion and chemical resistance to withstand the pallet cleaners and soluble fluxes.
By Olivier Constance. Electrical Wiring. Published at Thursday, December 28th 2017, 21:29:40 PM. Splices may be used within 30cm of a termination device when attaching to the pigtail spare lead of a potted termination device, to splice multiple wires to a single wire, or to adjust the wire sizes so that they are compatible with the contact crimp barrel sizes.
By Claudine Nicolette. Electrical Wiring. Published at Thursday, December 28th 2017, 21:14:12 PM. The fixture should support the board and prevent distortion as the board goes through the printing, component placement, and reflow processes. Its construction should ensure adequate protection for the bottom side components during the double-sided reflow process.
By Olivier Constance. Motor Wiring. Published at Thursday, December 28th 2017, 20:07:50 PM. The circular arrangement of electromagnets is divided into groups, each group called a phase, and there is an equal number of electromagnets per group. The number of groups is chosen by the designer of the stepper motor. The electromagnets of each group are interleaved with the electromagnets of other groups to form a uniform pattern of arrangement. For example, if the stepper motor has two groups identified as A or B, and ten electromagnets in total, then the grouping pattern would be ABABABABAB.
By Claudine Nicolette. Car Wiring. Published at Thursday, December 28th 2017, 19:22:21 PM. If this does not blow a fuse the wiring overheats and melts insulation, perhaps starting a fire. A similar result can come from fitting accessories incorrectly, or if power demand is too high for the size of the wire being used. After many years, insulation may become hard and brittle, particularly where it is exposed to heat, as in the engine bay. Sections, or all of the loom, may need replacing.
By Gaspard Magalie. Electrical Wiring. Published at Thursday, December 28th 2017, 17:50:11 PM. You can see how all the power supply connections use large traces or copper pours. The AWG doesn’t have high current requirements, but the board house doesn’t give you a discount for using less copper, so you might as well opt for large (= low-resistance, low-inductance) traces if you have the room.
By Dorian Yannic. Car Wiring. Published at Thursday, December 28th 2017, 17:40:13 PM. It is commonly known as the BENDIX type of solenoid. Such solenoids operate in three stages, the disengaged, partially engaged and engaged. In the disengaged position the drive gear is released and no current is flowing. In the partially engaged stage, current from the starter switch flows through both the pull-in and the hold-in coils.
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