By Douglas Self
This ebook is the basic reference for audio strength amplifier designers and engineers. writer Douglas Self covers the entire problems with distortion and linearity, energy offers, defense, reliability and format. He additionally tackles strange sorts of reimbursement and unforeseen resources of distortion equivalent to capacitors and fuses.
This a lot extended and up-to-date 5th version contains 4 NEW chapters, one in all them devoted to the XD crossover-displacement precept, invented through the writer, and utilized by Cambridge Audio. The publication has a wealth of recent fabric on four-stage amplifier architectures, current-mirrors, strength transistors with inner sensing diodes, amplifier bridging, refined distortion mechanisms, enter degree common-mode distortion, double enter levels, amplifier balance, output levels with achieve, transformers and hum fields, inrush present suppression, DC servo layout, thermal safeguard, the subtleties of cooling fan keep watch over, complex line enter phases, ultra-low-noise layout, excessive and low-pass filtering, checking out and safeguard, infra-red keep watch over, sign activation, 12V set off, point indication and masses extra. there's considerably improved fabric on expert energy amplifiers as utilized in sound reinforcement and pop applications.
This booklet is a must have for audio strength amplifier execs and audiophiles, novice constructors and an individual with highbrow interest in regards to the fight in the direction of technical excellence.
*Provides every thing you must be aware of in a single quantity, providing a vital consultant to layout principals and perform
*Includes quite a few graphs and a straightforward to learn format to demonstrate issues and relief entire understanding.
*Includes the author's personal amplifier designs for readers to construct upon and adapt
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Example text
It could be argued that parapsychology is a poor analogy because most people would accept that there was nothing there to study in the first place, whereas nobody would assert that objective measurements and subjective sound quality have no correlation at all; one need only pick up the telephone to remind oneself what a 4 kHz bandwidth and 10% or so THD sounds like. The most startling parallel I have found in the history of science is the almost forgotten affair of Blondlot and the N-rays[3]. In 1903, Rene Blondlot, a respected French physicist, claimed to have discovered a new form of radiation he called ‘N-rays’.
A second consequence of placing subjectivism above measurements is that it places designers in a most unenviable position. No degree of ingenuity or attention to technical detail can ensure a good review, and the pressure to adopt fashionable and expensive expedients (such as linear-crystal internal wiring) is great, even if the designer is certain that they have no audible effect for good or evil. Designers are faced with a choice between swallowing the subjectivist credo whole or keeping very quiet and leaving the talking to the marketing department.
65–67. [20] Hi-fi Choice, The Selection, Sportscene (1986). H. Lawry, High end difficulties, Stereophile (May 1995) p. 23. J. Moore, An Introduction to the Psychology of Hearing, Academic Press, 1982, pp. 48–50. [23] L. Fielder, Dynamic range issues in the Modern Digital Audio Environment, JAES p. 43. [24] D. Self, Advanced preamplifier design, Wireless World (November 1976) p. 41. [25] J. Moir, Just detectable distortion levels, Wireless World (February 1981) p. 34. L. J. Hawksford, Transconductance power amplifier systems for currentdriven loudspeakers, JAES p.