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我们在引进和使用国外产品或部件时,要客观地、历史地分析其特点,即不仅要了解它的优点和长处,还要了解它的缺点和不足,以便决定取舍和正确使用。然而,其缺点方面,单凭广告宣传和产品说明书是不可能了解的。它需要我们从元器件的内部结构及外围电路的组成,并结合该产品开发时科学技术发展的水平进行综合的分析。 KC582C是日立公司早期开发的黑白电视机稳压电源专用集成电路。当时(60年代中期),不仅没有PNP型大功率硅管,NPN型大功率硅管的成本也远高于PNP型锗管。所以,选用大功率锗管2SB337作为电源调整管,
When we introduce and use foreign products or components, we must objectively and historically analyze its characteristics not only in understanding its advantages and strengths, but also in understanding its shortcomings and deficiencies in order to decide the trade-offs and proper use. However, its shortcomings, advertising alone and product brochures is impossible to understand. It requires us from the internal structure of components and peripheral circuits, combined with the development of science and technology at the product development level to conduct a comprehensive analysis. KC582C Hitachi early development of black and white TV power supply integrated circuits. At the time (mid-1960s), not only did PNP-type high-power silicon tubes not be used, the cost of NPN-type high-power silicon tubes was much higher than that of PNP-type germanium tubes. Therefore, the selection of high-power germanium tube 2SB337 as power adjustment tube,