前几天群里大伙讨论时提到共同出资购买书籍，这个建议不错。这几天有点忙，但也一直在考虑怎么做。
初步打算是针对某本书籍，大家平均出资购买，如果是PDF文件，每人一份。如果是纸质书籍，复印出来一人一份。
PDF文件和纸质书籍原则上只允许个人学习使用，不要网盘共享，否则很多人一分钱不出，坐享其成了。
例如，大师E.M.Cherry的《Amplifying devices and low pass amplifier design》，PDF书籍我愿意出资100元。
此书推荐介绍：
Amplifying devices and low-pass amplifier design
E. M. CHERRY and D. E. HOOPER Wiley, 1968. 1036 pp. £14 '
Our aim has been to write a book that gives proven rules for circuit design and is of immediate use to practising engineers and scientists.
In fulfilling their aim, the authors have set down at great verbal length, and with a minimum of algebraic distraction, the fruits of considerable practical experience in the arts of amplifier design that extends back to the valve era. Following a brief introduction to amplifiers, there are three chapters dealing in detail with the characteristics of basic amplifier elements, in which the term 'charge control' is freely employed; but the circuit models given are of conventional controlledsource form. From the title, one would expect, in what follows, a filter-baseda pproach to direct-coupled broadband (e.g. video) amplifier-device coupling-network design. Instead, one finds that the entire treatment is centred on the a.c.-coupled single stage, with a valve or transistor in its common-cathode or -emitter configuration. There are five chapters on simple practical amplifiers' and two on the application of feedback. The next five chapters make separate extensions, at a more advanced level (using pole-zero patterns and Bode plots), to low- and high-frequency compensation, multistage feedback, differential and d.c. amplifiers, and power-output stages. The concluding chapter covers 'components, construction and reliability', and the text ends with a set of 113 'practice examples'. It will provide useful reading for those who are seeking information on practical amplifier design, rather than studying the modern theory of the subject in depth. To this extent the authors have achieved their aim, but at a prohibitive cost.
A., W. KEEN
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