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In a tape player, the small voltage variations from the voltage induced in a coil by magnetized regions on the tape are amplified to move the speaker coil In computers, small currents in the base-emitter circuits can turn on or turn off large currents in the collector-emitter circuits In addition, several transistors can be connected together to perform logic operations or to add numbers together In these cases, they act as fast switches rather than as amplifiers Microchips An integrated circuit, called a microchip, consists of thousands of transistors, diodes, resistors, and conductors, each less than a micrometer across All these components can be made by doping silicon with donor or acceptor atoms A microchip begins as an extremely pure single crystal of silicon, 10 30 cm in diameter and 1 2 m long, as shown in Figure 29-14 The silicon is sliced by a diamond-coated saw into wafers less than 1-mm thick The circuit is then built layer by layer on the surface of this wafer By a photographic process, most of the wafer s surface is covered by a protective layer, with a pattern of selected areas left uncovered so that they can be doped appropriately The wafer is then placed in a vacuum chamber Vapors of a dopant such as arsenic enter the machine, doping the wafer in the unprotected regions By controlling the amount of exposure, the engineer can control the conductivity of the exposed regions of the chip This process creates resistors, as well as one of the two layers of a diode or one of the three layers of a transistor The protective layer is removed, and another one with a different pattern of exposed areas is applied Then the wafer is exposed to another dopant, often gallium, producing pn-junctions If a third layer is added, npn-transistors can be formed The wafer also may be exposed to oxygen to produce areas of silicon dioxide insulation A layer exposed to aluminum vapors can produce a pattern of thin conducting pathways among the resistors, diodes, and transistors.

test=# analyze verbose store"Product"; INFO: analyzing "storeProduct" INFO: "Product": scanned 1 of 1 pages, containing 2 live rows and 6 dead rows; 2 rows in sample, 2 estimated total rows ANALYZE test=#

Now let s add some methods to the @implementation section of CurveView.m, in order to start intercepting the mouse activity we want to watch. The first method, mouseDown:, will be called whenever a user clicks in our view:

Figure 29-14 A technician prepares a large silicon crystal to be sliced into wafers for microchips

Figure 29-15 Microchips form the heart of the central processing unit of computers A penny is shown in the picture to represent scale

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Thousands of identical circuits, usually called chips, are produced at one time on a single wafer The chips are then tested, sliced apart, and mounted in a carrier; wires are attached to the contacts; and the final assembly is then sealed into a protective plastic body The tiny size of microchips, shown in Figure 29-15, allows the placement of complicated circuits in a small space Because electronic signals need only travel tiny distances, this miniaturization has increased the speed of computers Chips now are used in appliances and automobiles as well as in computers Semiconductor electronics requires that physicists, chemists, and engineers work together Physicists contribute their understanding of the motion of electrons and holes in semiconductors Physicists and chemists together add precisely controlled amounts of dopants to extremely pure silicon Engineers develop the means of mass-producing chips containing thousands of miniaturized diodes and transistors Together, their efforts have brought our world into this electronic age

27 Transistor Circuit The emitter current in a transistor circuit is always equal to the sum of the base current and the collector current: IE IB IC If the current gain from the base to the collector is 95, what is the ratio of emitter current to base current 28 Diode Voltage Drop If the diode characterized in Figure 29-10 is forward-biased by a battery and a series resistor so that there is more than 10 mA of current, the voltage drop is always about 070 V Assume that the battery voltage is increased by 1 V a By how much does the voltage across the diode or the voltage across the resistor increase b By how much does the current through the resistor increase

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