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certain frequency range without affecting the gain outside that range The positions of the controls on the front panel provide an intuitive graph of the output or response curve Figure 31-4 is a block diagram of a hypothetical graphic equalizer with seven gain controls The input is fed to an audio splitter that breaks the signal into seven paths of equal impedance, and prevents interaction among the circuits The seven signals are fed to audio attenuators, also called bandstop filters, each filter having its own gain control (The center frequencies of the attenuators in this example are at 30, 100, 300, and 900 Hz, and 25, 7, and 18 kHz These are not standard frequencies, and are given here only for illustrative purposes) The slide potentiometers affect the extent to which each filter affects the gain within its frequency range Finally, the signals pass through an audio mixer, and the composite is sent to the output There are several challenges in the design and proper use of graphic equalizers The filter gain controls must not interact Judicious choice of filter frequencies and responses is important The filters must not introduce distortion The active devices must not generate significant audio noise Graphic equalizers are not built to handle high power, so they must be placed at low-level points in an audio amplifier chain In a multichannel circuit such as a stereo sound system, a separate graphic equalizer can be used for each channel

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Figure 8-5

Mobile and portable hi-fi systems operate at low dc voltages Typical audio power levels are much lower than in home hi-fi systems Speakers are much smaller also In portable systems, headsets are often used in place of speakers

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Mobile Systems Mobile hi-fi systems, designed for cars and trucks, usually have four speakers The left and right channels each supply a pair of speakers The left stereo channel drives the left front and left rear speakers; the right stereo channel drives the right front and right rear speakers The balance control adjusts the ratio of sound volume between the left and right channels for both the front and rear speaker sets Another control adjusts the ratio of sound volume between the front and rear sets A mobile hi-fi system typically has an AM/FM receiver and a CD player Some older vehicles have systems with cassette tape players Newer, high-end cars and trucks have satellite radio receivers as well as conventional AM/FM receivers and CD players One note of caution: compact disks and cassettes are heat-sensitive, so they should not be stored in a car or truck that will be left out in the sun on a warm day Portable Systems Portable hi-fi systems operate from sets of dry cells or rechargeable cells The most well-known portable hi-fi set is the so-called headphone radio There are literally hundreds of different designs Some include only an FM radio; some have AM/FM reception capability Some have a small box with a cord that runs to the headset; others are entirely contained within the headset There are portable CD players and even portable satellite radio receivers The sound quality from these systems can be excellent The defining factor is the quality of the headset Another form of portable hi-fi set, sometimes called a boom box, can produce several watts of audio output, and delivers the sound to a pair of speakers built into the box A typical boom box is

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