sinclair, i r (1998) audio and hi-fi handbook (3rd ed )

... 2.3. Figure 2.2 The principal microphone directivity patterns. Figure 2.3 Artist’s impression of three-dimensional directivity patterns: (a) circle; (b) cardioid; (c) figure-of-eight; (d) hypercardioid; ... from electrical wiring and radio frequency interference. This is specially important in the vicinity of TV monitors, cameras, lighting regulators or transmitters. For outdoor work, or clo...

Ngày tải lên: 18/04/2014, 12:28

... supplies Design considerations for unregulated supplies Mains transformers Fusing and rectification RF emissions from bridge rectifiers Power supply-rail rejection A design philosophy for rail rejection Positive ... intractable problems of linearity, reliability and the need for intimidatingly expensive (and once more, non-linear) iron- cored transformers. The current fashion is for expo...

Ngày tải lên: 18/04/2014, 12:28

... Northern India tree is felled for its timber. Its seed oil is rich in stearic acid and can be used as a cocoa butter equivalent (CBE). The major acids are palmitic, stearic, oleic, linoleic, and ... where he was promoted via reader to professor in 1984. He is currently editor of four journals, including executive editor of Progress in Lipid Research. Dr. Harwood has published nearly 500 s...

Ngày tải lên: 02/04/2014, 16:00

... Diploma/Certifi cate unit, Further Electrical Principles, is found in the third edition of the companion book Further Electrical and Electronic Principles. C. Robertson Tonbridge March 2008 Preface ... current This is the rate at which free electrons can be made to drift through a material in a particular direction. In other words, it is the rate at which charge is moved around a ci...

Ngày tải lên: 05/04/2014, 23:01

... dynamic characteristics of a rectifier relate to its switching periods, both on and off. When a rectifier is switched into conduction a finite time is required for the minority carriers to ... watt, indicates the difference in temperature between junction and case, when the rectifier is dissipating power. It is required for designing rectifier cooling systems, as described in Chap...

Ngày tải lên: 18/04/2014, 12:24

... of dichroic filters and silvered mirrors as outlined in Figure 3.3. The dichroic filter is a precision- engineered optical device capable of reflecting one colour while appearing transparent ... light colours are used: red, green and blue. 15 Figure 2.1 Energy distribution curves for red, green and blue light The principle of additive light mixing, as it is called, is shown in Figure .....

Ngày tải lên: 18/04/2014, 12:26

... coverage in India was recorded in Nilgiri and Madurai districts of Tamil Nadu and Rajaori district of Jammu & Kashmir, where 99 percent children received complete schedule of immunization. In ... 400088, India RCH-RHS xviii in 11 districts of India not a single marriage of a girl below age 18 was reported (during the reference period). Out of the total births that occur...

Ngày tải lên: 05/03/2014, 10:20

... sideband (the two sidebands in AM contain identical intelligence) with a reduced carrier power, double sideband where the two sidebands carry different intelligence and again the carrier is reduced, ... ionising radiation in the form of X-rays are produced and for this reason the subject is covered in some detail in Chapter 8. It should be clear that this ionising radiation is not inheren...

Ngày tải lên: 18/04/2014, 12:27

... chip with solder-bumps on its underside. Like a BGA, it can be reflowsoldered directly to a circuit board IC Integrated circuit: an electronic circuit carried on the surface of a silicon wafer I/ O, ... their terminal wires pushed through their appropriate holes in the board. Their protruding ends were crimped over the lands, which surrounded the holes, and soldered to them, one by one (Fig...

Ngày tải lên: 18/04/2014, 12:28