By Madeleine Catherine. Motor. Publised at Sunday, December 31st 2017, 15:23:47 PM. A real step motor has losses that modify the ideal speed-torque curve. The most important effect is the contribution of detent torque. Detent torque is usually specified in the motor datasheet. It is always a loss when the motor is turning and the power consumed to overcome it is proportional to speed. In other words, the faster the motor turns the greater the detent torque contributes power loss at the motor’s output shaft. This power loss is proportional to speed and must be subtracted from the ideal, flat output power curve past the corner speed. This now constitutes a practical speed-torque curve.
By Sasha Sara. Car Wiring. Publised at Wednesday, January 10th 2018, 14:52:16 PM. Wiring. The mere mention of the subject brings chills to the spine of most performance car do-it-yourselfers. For most, it is part of the sacred trio of chores usually left to hired guns: bodywork/paint, upholstery, and wiring. But for those willing to do some research, practice a bit of trial and error, and spend the time and effort required, any of these chores can be (and are often) completed by those of us with at least a modicum of technical know-how.
By Charlotte Myriam. Diagram. Published at Monday, December 18th 2017, 08:48:15 AM. The slide switches are also known as “single throw-double pole” (STDP) switches, because only one switch (or throw) exists, but two positions (or poles) are available (a pole is an electrical contact to which the switch can make contact). These switches can be set to output either Vdd (when the actuator is closest to the board’s edge) or GND. The push button switches are also known as “momentary” contact buttons, because they only make contact while they are actively being pressed – they output a GND at rest, and a Vdd only when they are being pressed. The figure below shows typically pushbutton and slide switch circuits used on Digilent boards.
By Jessica Mireille. Power. Published at Monday, December 18th 2017, 08:45:14 AM. The quiescent current that a part draws from the source when idling (either shut down or not delivering significant amounts of load current) can be of critical importance in battery-powered applications.
By Charlotte Myriam. Diagram. Published at Monday, December 18th 2017, 08:14:06 AM. \
By Sasha Sara. Motor. Published at Monday, December 18th 2017, 08:03:25 AM. At this point it is important to introduce the concept of overdrive ration. This is the ration between the power supply voltage and the motor’s rated voltage. An empirically derived maximum is 25:1, meaning the power supply voltage should never exceed 25 times the motor’s rated voltage or 32 times the square root of motor inductance. Below is a graph of measured iron losses for a 4A, 3V motor. Notice in Figure 16 how the iron losses range from insignificant to being the major cause of heating in the motor compared to a constant 12W copper loss (4A times 3V).
By Lydie Honorine. Circuit. Published at Monday, December 18th 2017, 06:44:29 AM. A simple low-pass filter circuit, which allows low frequency signals to pass through the circuit while attenuating high-frequency signals, can be made using a resistor and capacitor in series.The transfer function of this filter can be determined by analyzing the circuit as a voltage divider,
By Charlotte Myriam. Diagram. Published at Monday, December 18th 2017, 06:12:46 AM. Variable resistors and potentiometers each augment the standard resistor symbol with an arrow. The variable resistor remains a two-terminal device, so the arrow is just laid diagonally across the middle. A potentiometer is a three-terminal device, so the arrow becomes the third terminal (the wiper).
By Valentine Sybille. Diagram. Published at Monday, December 18th 2017, 05:53:49 AM. Circuits often require output devices to communicate their state to an user. Examples of electronic output devices include computer monitors, LCD alphanumeric panels (as on a calculator), small lamps or light-emitting diodes (LED), etc. Digilent boards include different output devices, but all of them include some number of individual LED, and seven-segment LED displays that can display the digits 0-9 in each digit position (each segment in the seven-segment display contains a single LED). LED are two-terminal semiconductor devices that conduct current in only one direction (from the anode to the cathode). The small LED chips are secured inside a plastic housing, and they emit light at a givenfrequency (RED, YELLOW, etc.) when a small electric current (typically 10mA to 25mA) flows through them.
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