By Adrienne Emmanuel. Electrical Wiring. Publised at Saturday, January 06th 2018, 01:57:12 AM. Manufacturers can use fixtures or panels to secure or frame fragile, thin, or oddly shaped PCBs. This allows them to easily fit the boards in the standard assembly, reflow, or automatic inspection machines. In addition to handling the irregular boards, the technologies enable the simultaneous processing of multiple boards as opposed to working on each board individually, hence reducing the production time and costs.
By Claudine Nicolette. Electrical Wiring. Published at Saturday, February 17th 2018, 21:58:32 PM. Generally, the fixture materials, which range from synthetic plastics and stones to aluminum alloys and epoxy glass, should be electrostatic neutral, and able to withstand repeated thermal cycles and chemicals without deforming or wear. In particular, the thin fixtures provide better thermal management.
By Olivier Constance. Electrical Wiring. Published at Saturday, February 17th 2018, 18:11:50 PM. It’s always good to be cognizant of trace lengths when you’re laying out a parallel bus, though at moderate frequencies it is nothing to stress about. The propagation time for a signal traveling through a trace is maybe 150 picoseconds/inch. So if you have two traces with a length mismatch of one inch, one signal will arrive 150 ps after the other signal. If your signals are transitioning at a frequency whose corresponding period is much greater than 150 ps, this one-inch mismatch won’t cause problems. Even at 100 MHz (which is pretty fast for a parallel bus), the period is 10 ns, i.e., ~67 times larger than the time-of-arrival discrepancy for a one-inch mismatch.
By Olivier Constance. Electrical Wiring. Published at Saturday, February 17th 2018, 11:30:49 AM. This IC is available only in an 8-pin dual-flat no-leads (DFN) package, measuring a scant 2.5mm × 2.5mm with a tiny thickness of only 0.9mm. There is also, in addition to the eight pins, a thermal pad that is connected to ground (see image below).
By Cyrille Lothaire. Motor Wiring. Published at Saturday, February 17th 2018, 06:51:40 AM. They are not controlled through a circuit board or ESC. They have to be connected to the arduino through a motor shield or custom built circuit. They are typically the most expensive. Stepper motors can have 4, 5, 6, or 8 wires. To use them with the arduino, understanding the internal wiring is absolutely necessary. The best way to learn the internal wiring is to assume no manual exists, and "discover" the internal wiring.
By Claudine Nicolette. Car Wiring. Published at Saturday, February 17th 2018, 04:34:39 AM. Ring terminal This alternative to the spadeterminal is used on heavier components. "Scotchlok" connector The "Scotchlok" connector splices two wires together, using asharp metal blade which pierces theinsulation. This is clamped using a pair ofpliers, and covered with a plastic clip.
By Dorian Yannic. Electrical Wiring. Published at Friday, February 16th 2018, 23:39:49 PM. There are different panelization and de-panelization methods depending on the application of the PCB, thickness, shape, component layout, type of edges, and other factors. The two popular methods are the V-groove panelization and the breakaway tab panelization. Each of these uses a different method to separate the boards from the main array and has its advantages and limitations.
By Mailys Laurent. Electrical Wiring. Published at Friday, February 16th 2018, 21:42:01 PM. To overcome these challenges, engineers may use SMT fixtures or the panelization techniques. Each of the two methods provides a carrier with standard dimensions and provisions for fitting, securing and supporting the irregular boards.
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