1, carbon film resistors carbon film resistors are isolated organic carbon gino starting resistance in high-temperature vacuum furnace, and then the carbon deposited on the surface of the ceramic substrate is formed with a certain resistance (resistance by changing the size of the carbon The thickness of the resulting film or length) of the carbon film (resistor), and finally cut to the appropriate connector after thin, and coated with epoxy sealed and protected on its surface produced by a resistor, and therefore also known as pyrolytic carbon film resistors. The main features of the carbon film resistor is relatively good high-frequency characteristics, wide resistance range, cheap, but poor accuracy. China is currently the largest production volume, most widely used general-purpose resistor. It is widely used tape recorders, televisions and other electronic products. In power tools, solar products, battery protection board, all kinds of power supply design, the current sampling is enduring topic. Whether it is to do a general current control circuit, adjustment, or over-current protection, short circuit protection, the problem is the first step in considering the first detection of the current size. There are two more currently used sampling methods, one is to use a current transformer, and the other is to use a sense resistor. Current transformer performance when certain big current detection resistor drive start good, but expensive motor starter resistors, often for a small amount, and no requirements for cost places. So local mainstream types of power, electric tools, battery protection board, lamps, drive motor or the product's power section are all in economic, high-precision efficient, practical second way, which is the alloy resistance in this article, is used current sampling. Do sampling resistor, the resistor is generally placed in the need to sample the current position by measuring the voltage across the resistor to feedback, and to determine the current in the circuit size. Then the sampling resistor generally require relatively small, so as to allow into them does not affect the resistance of the current size of the original circuit, in order to ensure accurate sampling. The major products of the resistance range at 0.0005 mΩ ~ 200mΩ, resistance is small enough to be selected according to the sampling voltage corresponding design requirements. Motor starting resistance, Shandong starting resistance, provided by the electronic-kai-kai Electronics Co., Ltd. Nanjing. Nanjing-kai Electronics Co., Ltd. (www.eajay.com) strong, credible, in other industries in Shenzhen, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Yi Jia Electronics into the brilliant and you work for a better future!