By Gaspard Magalie. Electrical Wiring. Publised at Friday, February 09th 2018, 18:55:23 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 Cyrille Lothaire. Car Wiring. Publised at Friday, January 05th 2018, 19:31:18 PM. Rubber grommets are used where wirespass through holes drilled in the bodywork,to prevent sharp edges cutting theinsulation. Cable clips The loom and individual cables areheld to the bodywork by various types of clips.
By Gaspard Magalie. Motor Wiring. Published at Thursday, December 28th 2017, 10:08:52 AM. The outrunner is already the standard motor in laser printers, copy machines, fax machines, scanners, blue ray players, cd players, where a very precise, constant speed is needed. It is also found in model helicopters, RC airplanes and other variable speed applications where there are light weight requirements. It is totally different than all other motors.
By Olivier Constance. Electrical Wiring. Published at Thursday, December 28th 2017, 07:48:26 AM. The decoupling capacitors (C4, C5, C6, C7, C9, C10, C11) are arranged around the perimeter of the chip, very close to their respective power pins and to the vias that connect the caps to the internal planes. Notice how the smaller cap is always closer to the power pin; this is because we rely more on the lower-value capacitor for high-frequency bypassing, and thus the first priority is minimizing the inductance and resistance between the smaller cap and the pin.
By Fleurette Nina. Motor Wiring. Published at Thursday, December 28th 2017, 05:54:53 AM. An additional limitation, often comparable to the effects of inductance, is the back-EMF of the motor. As the motor rotor turns, a sinusoidal voltage is generated proportional to the speed (step rate). This AC voltage is subtracted from the voltage waveform available to induce a change in the current.
By Fleurette Nina. Electrical Wiring. Published at Thursday, December 28th 2017, 05:52:53 AM. 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 Mailys Laurent. Electrical Wiring. Published at Thursday, December 28th 2017, 05:20:31 AM. 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.
By Cyrille Lothaire. Electrical Wiring. Published at Thursday, December 28th 2017, 05:00:05 AM. However, the SMT components and the traces must be at least 3.00 mm from the perforation holes. This prevents the damage to the PCB or components which can occur due to surface stress and splinter when separating the boards. One drawback with this method is that it may leave some unwanted board protrusions on the edges.
By Adrienne Emmanuel. Car Wiring. Published at Thursday, December 28th 2017, 03:09:28 AM. Twist the bare ends together, then use pliers to press the twisted section into a compact shape. Solder the wires together so that they cannot be pulled apart, using only a little solder to avoid making the joint bulky. Wind insulating tape in a spiral over the joint.
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