By Claudine Nicolette. Electrical Wiring. Publised at Thursday, November 30th 2017, 15:12:14 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 Dorian Yannic. Electrical Wiring. Published at Tuesday, January 09th 2018, 11:44:16 AM. PCBs with SMT on both sides and those with mixed TH and SMTs may start to flex and bow when in the reflow oven or selective soldering machine. For this reason, the maximum size for this type of board is usually smaller than the single-sided. Breaking out the boards manually can stress the board and components near the edges, the solder joints, or leave out rough stubs on the edges
By Fleurette Nina. Car Wiring. Published at Tuesday, January 09th 2018, 09:25:53 AM. Both coils draw the plunger inward, causing it to pull the shift lever and engage the pinion gear. When the plunger is pulled into the coil all the way, the pinion fully engages the ring gear. When the ring gear is fully engaged, engine cranking begins. When the engine starts the hold-in coil will cut out and the plunger will move out, retracting the pinion and opening the starter switch.
By Mailys Laurent. Car Wiring. Published at Monday, January 08th 2018, 22:27:24 PM. Solder the wire to the connector with just enough solder to secure all the strands. Let the connector cool before sliding the cover back. Fitting a bullet connector. Remove insulation with a wire stripper. Use a wire stripper to remove about 3/8 in. (10 mm) of insulation from the end of the wire.
By Claudine Nicolette. Electrical Wiring. Published at Monday, January 08th 2018, 22:20:12 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 Dorian Yannic. Car Wiring. Published at Monday, January 08th 2018, 17:17:00 PM. STARTER SOLENOID "Relay" — All cars are wired so that the batterys main cable connects to the starter motor windings "the thick cable is needed for large current flow, right?". This wire must be switched on and off, of course, and it would be costly and inefficient to route it through the ignition switch "not to mention the size of the switchs components required to carry such current!". Consequently, a relay is necessary.
By Dorian Yannic. Electrical Wiring. Published at Monday, January 08th 2018, 16:08:43 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.
By Olivier Constance. Electrical Wiring. Published at Monday, January 08th 2018, 13:07:10 PM. The ease of loading and unloading the PCBs, as well as the ability to handle multiple PCBs, are important in high production lines. In addition, fixtures should provide thermal protection to the heat sensitive areas of the PCB.
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