By Claudine Nicolette. Electrical Wiring. Publised at Thursday, November 30th 2017, 15:12:14 PM. The datasheet goes on to say that "the nRESET pin is internally connected to VDD with a pull up resistor of 50 kΩ." So... why are there two options for how to configure the nReset pin when it is not being used? Why not just recommend that it should be left floating (since it is already pulled high internally)? And, if there are indeed technical reasons for when the pin should be externally pulled up to VDD (for better noise immunity, as an example) then let us know what those technical reasons are.
By Dorian Yannic. Motor Wiring. Published at Saturday, December 30th 2017, 17:51:58 PM. Stepper motor performance is strongly dependent on the driver circuit. Torque curves may be extended to greater speeds if the stator poles can be reversed more quickly, the limiting factor being a combination of the winding inductance. To overcome the inductance and switch the windings quickly, one must increase the drive voltage. This leads further to the necessity of limiting the current that these high voltages may otherwise induce.
By Claudine Nicolette. Car Wiring. Published at Saturday, December 30th 2017, 16:22:53 PM. Faller also produce lots individual vehicles to add to your road way including Cars, Tractors, Lorries and Buses. These vehicles all use the same power supply to charge the batteries so while a couple of vehicles are running around you could have one on charge ready to go for next time.In addition to vehicles, Faller has produced lots of accessory modules to create life on the roads. These include Bus Stops, Traffic lights, Stop sections and branch off sections. Most are available in both N and OO/HO Scales.
By Fleurette Nina. Car Wiring. Published at Saturday, December 30th 2017, 15:34:30 PM. Also look for grommets that have come out of their holes. The sharp edge of the hole will soon chafe through wire insulation and cause a short circuit. Whenever you pull a connection apart, look for corrosion which might cause bad contact. If necessary, clean contacting metal surfaces with a fine file or emery cloth.
By Gaspard Magalie. Motor Wiring. Published at Saturday, December 30th 2017, 13:07:39 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 Fleurette Nina. Electrical Wiring. Published at Saturday, December 30th 2017, 11:42:26 AM. V-groove panelization involves cutting a third of the board’s thickness from the top and bottom sides. The remaining part joins the separate boards and is then cut with a machine during the depaneling. This helps to reduce the stress on the PCB. One challenge with the V-groove method is that it is restrictive and cannot be used with PCBs that have overhanging components over the edges.
By Fleurette Nina. Electrical Wiring. Published at Saturday, December 30th 2017, 11:28:42 AM. Panelization is the arranging of arrays of multiple PCBs onto a single substrate that fits in the standard processing machine. A panel may hold multiple boards with similar or different sizes and shapes. This method is faster and less costly compared to the fixtures, which require a custom carrier for every new PCB design.
By Olivier Constance. Electrical Wiring. Published at Saturday, December 30th 2017, 09:22:32 AM. Note that U4, a 10 MHz MEMS oscillator, is also very close to the microcontroller’s clock input pin. It’s always a good idea to minimize the length of traces carrying high-frequency digital signals. First of all, there are noise benefits: a shorter, more direct trace reduces the amount of noise that would otherwise be coupled into adjacent traces, and a shorter trace also reduces electromagnetic interference (EMI) because it is less effective as an antenna. The second issue is related to transmission-line effects. Minimizing trace length is a simple way to avoid problems related to signal reflections. However, reflection is not a significant concern at frequencies in the 10 MHz range, unless you are dealing with long interconnections or a very large PCB.
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