By R. M. Marston
Audio IC Circuits handbook is a single-volume functional «user» details and circuitry advisor to the most well-liked and worthy of audio and audio-associated built-in circuits. This ebook bargains with ICs reminiscent of low frequency linear amplifiers, twin pre-amplifiers, audio strength amplifiers, charged-coupled equipment hold up traces, bar-graph reveal drivers, and tool provide regulators. This ebook is split into seven chapters that target the applying of those units in circuits starting from uncomplicated sign conditioners and filters to complicated photo equalizers, stereo amplifier structures, and echo/reverb hold up line platforms. Chapters 1 to four take care of natural «audio» matters, resembling audio processing circuits, audio pre-amplifier circuits, and audio energy amplifier circuits. Chapters five and six reflect on audio-associated topics of light-emitting diode bar-graph monitors, and CCD delay-line circuits. bankruptcy 7 bargains with strength offer circuits to be used in audio platforms. This guide 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 screens 112 6. CCD audio delay-line circuits 132 7. strength provide circuits 154 Index 166
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When very small signals are applied to this circuit the diodes act like very high resistances, so the circuit gives high voltage gain, but when large signals are applied the diodes act like low resistances, so the circuit gives low gain. The gain in fact varies in a semilogarithmic fashion, and circuit sensitivity can be varied by altering the Rx value; the table shows actual performance details. N o t e that a 1000:1 change in input signal amplitude can cause as little as a 2:1 change in output level, so, by taking its output to a simple A C millivoltmeter, this circuit can be used as a single-range bridgebalance detector or signal strength indicator, etc.
All of these devices give excellent power-supply ripple rejection, low signal distortion, a wide bandwidth, and a very low noise figure. 1 Block diagram of one channel of a hi-fi 46 system Audio pre-amplifier circuits 47 National Semiconductor C o r p o r a t i o n ' s L M 3 8 1 / L M 3 8 2 / L M 3 8 7 family of dual audio pre-amplifier ICs, and most of this chapter is devoted to taking an in-deptn look at this range of devices. We also take a brief look at one other popular (but slightly less well known) pre-amp IC, however, and this is the TDA3410, which is another ultra-low-noise dual pre-amp.
The peak current that can flow into this 10 k load is 500 μ A ( = / b i a X so the peak available s Audio processing circuits 31 output voltage is plus or minus 5 V. 8 V//u,s. 40. 41, where the two input diodes are biased, via R3, with current 7 D , which flows to ground via R2 and R4. 41 inverting ac amplifier with near-unity overall voltage gain Note in this circuit that the input signal is applied to the non-inverting input terminal via Ri, and that Ri and R2 form a voltage divider that attenuates the input signal, and that the circuit consequently gives an overall voltage gain of slightly less than unity.
Audio IC Circuits Manual by R. M. Marston