By Jessica Mireille. Power. Publised at Monday, December 18th 2017, 08:45:14 AM. The output resistance (also known as source resistance) of a voltage regulator is a close cousin of its load regulation. Figure 1 illustrates how the output voltage of a regulator typically changes as a function of load current. Initially, the slope is quite linear but once the load current becomes higher than the design then the voltage will often drop rapidly with an increase in current. We measure the output resistance only on the linear portion of the plot in the normal operating region. It is meaningless to use a point in the overload area as that will result in an artificially high output resistance.
By Charlotte Myriam. Diagram. Published at Friday, December 22nd 2017, 18:19:02 PM. 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.
By Lydie Honorine. Power. Published at Friday, December 22nd 2017, 17:54:13 PM. Another characteristic of any linear regulator is that it requires a finite amount of time to "correct" the output voltage after a change in load current demand. This "time lag" defines the characteristic called transient response, which is a measure of how fast the regulator returns to steady-state conditions after a load change.
By Bertille Solange. Circuit. Published at Friday, December 22nd 2017, 17:48:48 PM. When a voltage is applied across a conductor, a current will begin to flow. The ratio between voltage and current is known as resistance. For most metallic conductors, the relationship between voltage and current is linear.
By Madeleine Catherine. Diagram. Published at Friday, December 22nd 2017, 15:33:09 PM. A capacitor is a two-terminal device that can store electric energy in the form of charged particles. You can think of a capacitor as a reservoir of charge that takes time to fill or empty. The voltage across a capacitor is proportional to the amount of charge it is storing – the more charge added to a capacitor of a given size, the larger the voltage across the capacitor. It is not possible to instantaneously move charge to or from a capacitor, so it is not possible to instantaneously change the voltage across a capacitor. It is this property that makes capacitors useful on Digilent boards and in many other applications.
By Cyrielle Marjolaine. Diagram. Published at Friday, December 22nd 2017, 15:11:58 PM. On all but the simplest PCBs, wires must be printed on more than one surface of fiberglass to allow for all the required component interconnections. Each surface containing printed wires is called a layer. In a relatively simple PCB that requires only two layers, only one piece of fiberglass is required since wires can be printed on both sides. In a more complex PCB where several layers are required, individual circuit boards are manufactured separately and then laminated together to form one multi-layer circuit board. To connect wires on two or more layers, small holes called vias are drilled through the wires and fiberglass board at the point where the wires on the different layers cross. The interior surface of these holes is coated with metal so that electric current can flow through the vias. Most Digilent boards are simple four or six layer boards; some more complex computer circuit boards have more than 20 layers.
By Bertille Solange. Diagram. Published at Friday, December 22nd 2017, 15:03:02 PM. In addition to reading this instructable it may be a good idea for you to read my other instructable "electronics components and what they do" to get a good understanding of what you are doing when building a project.
By Valentine Sybille. Diagram. Published at Friday, December 22nd 2017, 14:26:32 PM. 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.
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