By R. M. Marston
Audio IC Circuits guide is a single-volume useful «user» info and circuitry consultant to the preferred and worthy of audio and audio-associated built-in circuits. This ebook offers with ICs equivalent to low frequency linear amplifiers, twin pre-amplifiers, audio strength amplifiers, charged-coupled machine hold up strains, bar-graph reveal drivers, and gear provide regulators. This publication is split into seven chapters that target the appliance of those units in circuits starting from easy sign conditioners and filters to complicated picture equalizers, stereo amplifier platforms, and echo/reverb hold up line structures. Chapters 1 to four care for natural «audio» topics, akin to audio processing circuits, audio pre-amplifier circuits, and audio energy amplifier circuits. Chapters five and six think about audio-associated topics of light-emitting diode bar-graph screens, and CCD delay-line circuits. bankruptcy 7 bargains with strength provide circuits to be used in audio platforms. This handbook is meant essentially to layout engineers, technicians, and digital scholars. Contents Prefacevii 1. Audio processing circuits 1 2. Audio pre-amplifier circuits forty six three. Audio energy amplifier circuits sixty five four. High-power audio amplifiers ninety one five. LED bar-graph monitors 112 6. CCD audio delay-line circuits 132 7. energy provide circuits 154 Index 166
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5 , so these two currents tend to self-cancel. In use, the O T A gain is pre-set via R Vx so that the two currents are exactly balanced when the modulation input is tied to the c o m m o n zero volts line, and under this condition the circuit gives zero carrier output. Consequently, when the modulation input moves positive, the O T A gain increases and its output current to R5 exceeds that caused by the direct input signal, so an inverted output carrier signal is generated. Conversely, when the modulation input moves negative the O T A gain decreases and the direct signal current of R5 exceeds that generated by the O T A output, so a noinverted output signal is generated.
N o t e that two of these pre-amp circuits are needed in a stereo audio system, and these can thus be obtained from one 'dual' IC. 34 circuit is fairly simple. 4)- R2 determines the circuit's dc biasing, and the R5-C3-C4-R4 and R5-C2 networks determine the ac signal gain. At the 1 k H z m i d b a n d frequency, C 2 and C 3 have low impedances a n d C 4 has a high impedance, so the ac gain is determined mainly by R5IR5, a n d equals χ 400. At lower frequencies the impedance of C 3 starts to become significant and causes the ac gain to increase until eventually, at very low frequencies, it is limited to χ 4000 by the R3/R5 ratio.
Input bias resistors Ri a n d R2 have low values to minimize the I C s noise levels and enhance stability; offset biasing is applied via R3-RVi. 48 Amplitude modulator ( 1) 36 Audio processing circuits when Rx has the value signal is applied to pin-2 via potential divider Rx-Rû shown, the circuit gives near-unity overall voltage gain with zero modulation input; the gain doubles when the modulation terminal swings to + 9 V, and falls to near-zero (actually - 80 dB) when the terminal swings to - 9 V.
Audio IC Circuits Manual by R. M. Marston