how to connect barcode scanner to visual basic 2010 Transistors in Software

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Transistors
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Transistors were designed as an alternative to the old vacuum tube, and they are used in similar applications, either to amplify a signal or to switch a signal on and off. At last count there were several thousand different transistors available. Besides amplifying or switching a current, transistors are divided into two broad categories:
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I Signal. These transistors are used with relatively low current circuits, like radios, telephones, and most other hobby electronics projects.
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I Power. These transistors are used with high-current circuits, like motor drivers and
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power supplies. You can usually tell the difference between the two merely by size. The signal transistor is rarely larger than a pea and uses slender wire leads. The power transistor uses a large metal case to help dissipate heat and heavy spokelike leads. Transistors are identified by a unique code, such as 2N2222 or MPS6519. Refer to a data book to ascertain the characteristics and ratings of the particular transistor you are interested in. Transistors are rated by a number of criteria, which are far too extensive for the scope of this book. These ratings include collector-to-base voltage, collector-toemitter voltage, maximum collector current, maximum device dissipation, and maximum operating frequency. None of these ratings are printed directly on the transistor. Signal transistors are available in either plastic or metal cases. The plastic kind is suitable for most uses, but some precision applications require the metal variety. Transistors that use metal cases (or cans ) are less susceptible to stray radio frequency interference. They also dissipate heat more readily. Power transistors come in metal cases, though a portion of the case (the back or sides) may be made of plastic. Fig. 5.5a shows the most common varieties of transistor cases. You ll often encounter the TO-220 and TO-3 style in your hobby electronics ventures. Transistors have three or four wire leads. The leads in the typical three-lead transistor are base, emitter, and collector, as shown in Fig. 5.5b. A few transistors, most notably the field-effect transistor (or FET), have a fourth lead. This is for grounding the case to the chassis of the circuit.
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SCHEMATICS AND ELECTRONIC SYMBOLS 61
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Transistor bases (as viewed from bottom) A TO-220 TO-92 TO-3
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Schematic symbol for a transistor
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FIGURE 5.5 The most common transistor bases.
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Transistors can be either NPN or PNP devices. This nomenclature refers to the sandwiching of semiconductor materials inside the device. You can t tell the difference between an NPN and PNP transistor just by looking at it. However, the difference is indicated in the catalog specifications sheet as well as schematically. Some semiconductor devices look and act like transistors and are actually called transistors, but in reality they use a different technology. For example, the MOSFET (for metal-oxide semiconductor field-effect transistor) is often used in circuits that demand high current and high tolerance. MOSFET transistors don t use the standard base-emittercollector connections. Instead, they call them gate, drain, and source. Note, too, that the schematic diagram for the MOSFET is different than for the standard transistor.
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Integrated Circuits
The integrated circuit forms the backbone of the electronics revolution. The typical integrated circuit comprises many transistors, diodes, resistors, and even capacitors. As its name implies, the integrated circuit, or IC, is a discrete and wholly functioning circuit in its own right. ICs are the building blocks of larger circuits. By merely stringing them together you can form just about any project you envision. Integrated circuits are most often enclosed in dual in-line packages (DIPs), as shown in Fig. 5.6. The illustration shows several sizes of DIP ICs, from 8-pin to 40-pin. The most common are 8-, 14-, and 16-pin. The IC can either be soldered directly into the circuit board or mounted in a socket. As with transistors, ICs are identified by a unique code, such as 7400 or 4017. This code indicates the type of device. You can use this code to look up the specifications and parameters of the IC in a reference book. Many ICs also contain other written information, including manufacturer catalog number and date code. Do not confuse the date code or catalog number with the code used to identify the device.
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