R 3.7 CARBON FILM Carbon film resistors sometimes are called surface layer resistors. Better qualities are classified as “stable” with a ΔR/R that will stop at ≤1%. Their role has, to a great extent, been taken over by the metal film but they still have a market, especially as cheap 5 per cent E 24 components. At new designs one should yet consider replacing...
R 3 NON-WIREWOUND RESISTORS R 3.1 OVERVIEW Non-wirewound resistive elements may be produced and arranged in a lot of different ways. We shall present the following types, differentiated by constructional material or specific design: R 3.2 Film resistors, in generalR 3.3 Metal film / thin filmR 3.4 Metal foilR 3.5 Metal glaze/thick filmR 3.6 Metal oxide /"metox"R 3.7 Carbon filmR 3.8 Carbon compositionR 3.9 ...
L.1.8 Differentiating EMC ferrite ↔ inductor The terminology used in this handbook clearly distinguishes between inductors and EMC ferrites in regard to the quality of the inductor: EMC ferrites are based on Ni-Zn materials. This material has good quality factors (Q < 3) above approx. 20 MHz – i.e. trimmed for high losses. These originate in the core material and serve to absorb EMC...
C2.0 ELECTROSTATIC NON-POLARIZED CAPACITORS C2.1 CONSTRUCTIONAL SOLUTIONS The search for capacitance in small volumes has created a number of different solutions, each with its advantages and drawbacks. We shall try in this chapter to describe both methods and problems of achieving large C/V ratios. Further details may be added in specific material sections. The latter part of this chapter deals with some general construction...
R 2 WIREWOUND RESISTORS R 2.1 GENERAL COMMENTS As the name indicates wirewound resistors consist of a resistive wire wound on a bobbin and supplied with a protective coating. Since the resistance wire never can serve as a termination wire because of solderability requirements, it has to be connected to the terminal leads or the like, usually by welding or brazing. The higher the...
