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Technical considerations 587 If the listener moves a few feet, the antinodes will no longer be observed at 700 Hz and its harmonics. The frequency might change; the effect might diminish or even seem to disappear altogether. As produced by the set of baffles, the antinode for 700 Hz and its harmonics might well be confined to a single, small spot in the room. One of the most important considerations in acoustical design is the avoidance, to the greatest extent possible, of significant nodes and antinodes at any frequency within the range of human hearing. The perfect acoustic chamber delivers sound effectively to all members of the listening audience, without favoring any particular regions of the room or frequencies of the sound.

The diagram in Fig. 25-5 highlights how to connect high-power output devices to the Xlink control system. As mentioned, the X-link system provides an output for external devices. Output pins 18 (P8) through 23 (P13) from the controller are connected through 1-k resistors to the base of the 2N3904 relay driver transistors. Relay 1 is a 5-V driver relay that can be used to turn on Sonalert or other small sounders or lamps. You can also use relay 1 to drive a second higher-current relay, which can be used to drive a large motor siren or strobe lamp, etc. The smaller 5-V relay at relay 1 is used to drive the larger-current 110-V relay 2. So, for low-current loads only one relay is needed, while higher-current loads must have two relays, to control motors, pumps, and heating and cooling devices.

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High-fidelity, or hi-fi, audio systems can be found in most homes, in many cars and trucks, in businesses, and even in government offices. They range in size from tiny headphone radios that operate from one AAA cell to huge, multicomponent systems that consume thousands of watts and provide the sound for musical concerts in auditoriums and stadiums. However big or small the system, it must have certain characteristics to truly earn the label hi-fi.

Linearity is the extent to which the output waveform of an amplifier is a faithful reproduction of the input waveform In hi-fi equipment, all the amplifiers must be as linear as the state of the art allows If you connect a dual-trace oscilloscope (one that lets you observe two waveforms at the same time) to the input and output terminals of a good hi-fi audio amplifier, the output waveform will appear as a vertically magnified duplicate of the input waveform If you adjust the vertical gain control of the oscilloscope so the two waveforms have the same peak-to-peak displacement on the screen, the input and output waveforms will look identical When the input signal is applied to the horizontal scope input and the output signal is applied to the vertical scope input, the display will be a straight line Figures 31-2 and 31-3 illustrate the principle of linearity.

The X-link control system was fabricated on a 3- by 5-in double-sided circuit board, which houses the STAMP 2 microprocessor, the optional X-link server, and the glue, or support components (Fig. 25-6). A 5-V regulator, at U4, powers the STAMP 2, the mini web server, and associated support components. The 9-V zener is used for the a reference source for relay control.

EXHIBIT 2-9

The graph and waveforms in Fig 31-2 show the characteristics of a linear circuit The graph of the instantaneous output versus the instantaneous input is a straight line When the input is a sine wave, the output is also a sine wave Figure 31-3 shows what takes place in a hypothetical nonlinear circuit The instantaneous output-versus-input function is not a straight line Therefore, the output waveform is not a faithful reproduction of the input, and distortion occurs In this case, as the input increases, the output-to-input ratio (amplification factor, or gain) decreases, as indicated by the decreasing slope of the curve At high input levels, the circuit doesn t amplify as much as it does at low input levels, which flattens the peaks of the output wave This happens with all amplifiers if the input signal amplitude is great enough.

1 2 3 4

In some radio-frequency circuits this is all right; in hi-fi audio systems, it is not Linear amplifiers are designed to work with input signals up to a certain peak (maximum instantaneous) amplitude If the peak input exceeds this level, the amplifier will become nonlinear, and distortion will result In a hi-fi system equipped with VU or.

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