barcode in vb.net 2010 Transformers and Impedance Matching in Software

Drawer Code 39 in Software Transformers and Impedance Matching

294 Transformers and Impedance Matching
USS Code 39 Recognizer In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Generate Code 39 Full ASCII In None
Using Barcode printer for Software Control to generate, create USS Code 39 image in Software applications.
18-9 At A, an outlet for three-phase, 234-V rms utility ac. At B, a
Code 3 Of 9 Reader In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
Code 3 Of 9 Generator In Visual C#
Using Barcode printer for .NET Control to generate, create Code39 image in Visual Studio .NET applications.
conventional single-phase utility outlet for 117-V rms utility ac.
Create Code-39 In .NET Framework
Using Barcode generator for ASP.NET Control to generate, create Code 39 Full ASCII image in ASP.NET applications.
Code 39 Full ASCII Creator In Visual Studio .NET
Using Barcode maker for .NET Control to generate, create Code 3/9 image in Visual Studio .NET applications.
sistors can demand more than 1000 W (1 kW ) in some cases. At 12 V, this translates to a current demand of 90 A or more. Television sets have cathode-ray tubes that need several hundred volts. This is derived by using a step-up transformer in the power supply. Such transformers don t have to supply a lot of current, though, so they are not very big or heavy. Another type of device that needs rather high voltage is a ham-radio amplifier with vacuum tubes. Such an amplifier requires from 2 kV to 5 kV. Any voltage higher than about 12 V should be treated with respect. Warning: The voltages in televisions and ham radios can present an electrocution hazard, even after the equipment has been switched off. Do not try to service such equipment unless you are trained to do so!
Encode Code39 In VB.NET
Using Barcode printer for VS .NET Control to generate, create Code 3/9 image in Visual Studio .NET applications.
EAN128 Generation In None
Using Barcode creator for Software Control to generate, create GTIN - 128 image in Software applications.
At Audio Frequencies Transformers for use at AF are similar to those employed for 60-Hz electricity. The differences are that the frequency is somewhat higher (up to 20 kHz), and that audio signals exist in a band of frequencies (20 Hz to 20 kHz) rather than at only one frequency. Most AF transformers are constructed like miniature utility transformers. They have laminated E cores with primary and secondary windings wound around the crossbars, as shown in Fig. 18-4. Audio transformers can be either the step-up or the step-down type. However, rather than being made to produce a specific voltage, AF transformers are designed to match impedances. Audio circuits, and in fact all electronic circuits that handle sine-wave or complex-wave signals, exhibit impedance at the input and output. The load has a certain impedance; a source has another impedance. Good audio design strives to minimize the reactance in the circuitry, so that the absolute-value impedance Z is close to the resistance R. This means that X must be zero or nearly zero. In the following discussion of impedance-matching transformers, for both AF and RF applications, assume that the reactance is zero, so the impedance is purely resistive with Z = R + j 0.
Encode Code 128 In None
Using Barcode maker for Software Control to generate, create USS Code 128 image in Software applications.
Making USS Code 39 In None
Using Barcode printer for Software Control to generate, create Code 39 image in Software applications.
Isolation and Impedance Matching
Paint Barcode In None
Using Barcode printer for Software Control to generate, create barcode image in Software applications.
Drawing GTIN - 13 In None
Using Barcode generator for Software Control to generate, create EAN / UCC - 13 image in Software applications.
Transformers can provide isolation between electronic circuits. While there is inductive coupling in a transformer, there is comparatively little capacitive coupling. The amount of capacitive coupling can be reduced by using cores that minimize the number of wire turns needed in the windings, and by keeping the windings physically separated from each other (rather than overlapping).
USPS OneCode Solution Barcode Encoder In None
Using Barcode generator for Software Control to generate, create OneCode image in Software applications.
Making EAN-13 In Java
Using Barcode generator for Java Control to generate, create EAN-13 image in Java applications.
Isolation and Impedance Matching 295
Creating Matrix Barcode In VS .NET
Using Barcode creator for .NET framework Control to generate, create Matrix 2D Barcode image in .NET framework applications.
Linear Barcode Drawer In VS .NET
Using Barcode drawer for VS .NET Control to generate, create 1D image in .NET applications.
Balanced and Unbalanced Loads and Lines A balanced load is one whose terminals can be reversed without significantly affecting circuit behavior. A plain resistor is a good example. The two-wire antenna input in a television receiver is another example of a balanced load. A balanced transmission line is usually a two-wire line, such as oldfashioned TV ribbon, also called twinlead. An unbalanced load is a load that must be connected a certain way. Switching its leads will result in improper circuit operation. In this sense, an unbalanced load is a little like a polarized component such as a battery or capacitor. Many wireless antennas are of this type. Usually, unbalanced sources and loads have one side connected to ground. The coaxial input of a television receiver is unbalanced; the shield (braid) of the cable is grounded. An unbalanced transmission line is usually a coaxial line, such as you find in a cable television system. Normally, you cannot connect an unbalanced line to a balanced load, or a balanced line to an unbalanced load, and expect good performance. But a transformer can allow for mating between these two types of systems. In Fig. 18-10A, a balanced-to-unbalanced transformer is shown. Note that the balanced side is center-tapped, and the tap is grounded. In Fig. 18-10B, an unbalanced-tobalanced transformer is illustrated. Again, the balanced side has a grounded center tap. The turns ratio of a balanced-to-unbalanced transformer (also called a balun) or an unbalancedto-balanced transformer (also known as an unbal) can be 1:1, but this need not be the case, and often it is not. If the impedances of the balanced and unbalanced parts of the systems are the same, then a 1:1 turns ratio is ideal. But if the impedances differ, the turns ratio should be such that the impedances are matched. Shortly, we ll see how the turns ratio of a transformer can be manipulated to transform one purely resistive impedance into another. Transformer Coupling Transformers are sometimes used between amplifier stages in electronic equipment where a large amplification factor is needed. There are other methods of coupling from one amplifier stage to another, but transformers offer some advantages, especially in RF receivers and transmitters. Part of the problem in getting a radio to work is that the amplifiers must operate in a stable manner. If there is too much feedback, a series of amplifiers will oscillate, and this will severely degrade the performance of the radio. Transformers that minimize the capacitance between the amplifier stages, while still transferring the desired signals, can help to prevent this oscillation.
Printing Data Matrix In Java
Using Barcode printer for Java Control to generate, create ECC200 image in Java applications.
ECC200 Maker In C#.NET
Using Barcode encoder for .NET Control to generate, create DataMatrix image in .NET applications.
Decode Bar Code In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Code 3 Of 9 Generator In Java
Using Barcode encoder for Android Control to generate, create Code39 image in Android applications.
Copyright © OnBarcode.com . All rights reserved.