By Claudine Nicolette. Electrical Wiring. Publised at Thursday, November 30th 2017, 15:12:14 PM. 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 France Barbara. Motor Wiring. Publised at Wednesday, November 29th 2017, 13:27:40 PM. Speed can be varied by either changing the voltage or pulsing the motor. Most computer controlled DC motors are pulsed. Pulses of a fixed voltage are sent to the motor, usually by an Electronic Speed Controller or ESC. A pulse of 1.5 ms causes no motion. Wider pulses cause faster spinning in one direction. Shorter pulses cause faster spinning in the opposite direction. Eventually, an overstressed ESC stops pulsing and turns one wire on and one wire off, depending on the direction.
By Mailys Laurent. Electrical Wiring. Publised at Tuesday, November 28th 2017, 06:55:28 AM. Reset pin may be used to generate a system reset of the IC. And while a reset may also be externally generated by issuing a command (referred to as a soft reset), to achieve a full reset it is recommended to use the nReset pin (or of course you can also cycle power). On the other hand, if this pin is not to be used then it is recommended that it is either left floating or tied to VDD via a series resistor of value ≥2 kΩ.
By Dorian Yannic. Motor Wiring. Published at Friday, December 29th 2017, 07:22:49 AM. A unipolar stepper motor has one winding with center tap per phase. Each section of windings is switched on for each direction of magnetic field. Since in this arrangement a magnetic pole can be reversed without switching the direction of current, the commutation circuit can be made very simple (e.g., a single transistor) for each winding. Typically, given a phase, the center tap of each winding is made common: giving three leads per phase and six leads for a typical two phase motor. Often, these two phase commons are internally joined, so the motor has only five leads.
By Fleurette Nina. Electrical Wiring. Published at Friday, December 29th 2017, 07:16:00 AM. As you may have noticed, this is one of those annoying situations in which the pin configuration is the opposite of what you want: the DAC’s input pins move from bit 7 to bit 0 going downward, whereas the MCU’s output pins move from bit 7 to bit 0 going upward. I couldn’t remedy this by re-assigning the microcontroller pins because I wanted the data bits to correspond to the actual bits of the Port 2 register (so that I could write a full byte to the DAC without moving bits around). So I ended up with some awkward routing, but nothing terrible.
By Cyrille Lothaire. Car Wiring. Published at Friday, December 29th 2017, 05:12:16 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.
By Fleurette Nina. Car Wiring. Published at Friday, December 29th 2017, 04:22:33 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.
By Claudine Nicolette. Electrical Wiring. Published at Friday, December 29th 2017, 03:35:52 AM. Since the finite-impulse-response (FIR) filtering is a common operation in DSP, we will continue our discussion based on examining the difference equation of an FIR filter. This simple example will show the typical properties of many DSP algorithms. After reviewing the problem of handling the incoming samples, we will discuss the circular buffering as an efficient solution to the problem.
By Adrienne Emmanuel. Motor Wiring. Published at Friday, December 29th 2017, 03:09:39 AM. What is commonly referred to as microstepping is often sine–cosine microstepping in which the winding current approximates a sinusoidal AC waveform. Sine–cosine microstepping is the most common form, but other waveforms can be used. Regardless of the waveform used, as the microsteps become smaller, motor operation becomes more smooth, thereby greatly reducing resonance in any parts the motor may be connected to, as well as the motor itself. Resolution will be limited by the mechanical stiction, backlash, and other sources of error between the motor and the end device. Gear reducers may be used to increase resolution of positioning.
By Fleurette Nina. Car Wiring. Published at Friday, December 29th 2017, 03:06:25 AM. With all those things to worry about, many enthusiasts overlook the electrical wiring system. A lousy wiring job will keep your electrical accessories from operating at full potential—and that means subpar performance. Many people are intimidated by the prospect of wiring a vehicle. But a proper wiring job doesn’t have to be a scary task—we’ve put together a few tips to help make the job a little bit smoother.
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