By Mailys Laurent. Car Wiring. Publised at Thursday, December 28th 2017, 17:09:32 PM. Use a 25-65 watt iron for most work, and a 150-250 watt one for large cables, or an 8 oz (225 g) gas-heated iron. Working safelyDisconnect both terminals of the battery before doing any work on wiring other than testing. Whenever you work on the car, watch for any part of the loom coming loose from its clips, for there is a risk of it getting trapped or burned. Always replace wiring in its clips.
By Claudine Nicolette. Car Wiring. Published at Friday, January 05th 2018, 14:47:47 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 Cyrille Lothaire. Electrical Wiring. Published at Friday, January 05th 2018, 12:13:08 PM. Sensirion provides detailed information on both the package outline and the land pattern. In fact, it is recommended, because the IC pad pitch is just 0.5 mm, that only one solder mask opening should be used for all four pads on one side. It is also suggested, when using solder paste printing, that a laser-cut stainless steel stencil with trapezoidal walls and with a stencil thickness of 0.1 or 0.125 mm should be used. See the images below. This information should be quite helpful for a PCB layout design team.
By Dorian Yannic. Electrical Wiring. Published at Friday, January 05th 2018, 11:51:25 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 Mailys Laurent. Motor Wiring. Published at Friday, January 05th 2018, 11:15:02 AM. Identical model motors vary, so each needs to be calibrated by banging against some edge ... think of the banging noise when an inkjet printer is turned on. Servo motors are good for robot wheels that have to turn a certain distance then stop. They are good for robots that have to balance themselves somehow. Auto pilots can use these to navigate a hallway. They are not good for spinning propellers like brushed dc motors and brushless motors.
By Cyrille Lothaire. Motor Wiring. Published at Friday, January 05th 2018, 10:25:56 AM. Brushed DC motors rotate continuously when DC voltage is applied to their terminals. The stepper motor is known by its property to convert a train of input pulses (typically square wave pulses) into a precisely defined increment in the shaft position. Each pulse moves the shaft through a fixed angle. Stepper motors effectively have multiple "toothed" electromagnets arranged around a central gear-shaped piece of iron. The electromagnets are energized by an external driver circuit or a micro controller. To make the motor shaft turn, first, one electromagnet is given power, which magnetically attracts the gear teeth. When the gear teeth are aligned to the first electromagnet, they are slightly offset from the next electromagnet.
By Mailys Laurent. Motor Wiring. Published at Friday, January 05th 2018, 09:37:00 AM. A common type of servo provides position control. Commonly, servos are electrical, hydraulic or pneumatic. They operate on the principle of negative feedback, where the control input is compared to the actual position of the mechanical system as measured by some sort of transducer at the output. Any difference between the actual and wanted values (an "error signal") is amplified (and converted) and used to drive the system in the direction necessary to reduce or eliminate the error. This procedure is one widely used application of control theory. Typical servos can give a rotary (angular) or linear output.
By Cyrille Lothaire. Electrical Wiring. Published at Friday, January 05th 2018, 09:31:29 AM. SMT fixtures are rigid PCB carriers that allow manufacturers to load single or multiple irregular boards, and then take them through the standard processing machines. This makes it possible to carry out tasks such as automatic mounting of electronic components, infra-red reflow soldering, wave soldering, automatic testing, etc.
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