Carbon Film Resistor
Carbon film resistance (carbon film resistance) for the earliest and most commonly used resistors, the use of vacuum spraying technology on the porcelain rod sprayed a layer of carbon film, and then the carbon film outer processing cut into a spiral pattern, according to the amount of spiral lines to set its resistance value, the more the spiral pattern indicates the greater the resistance value. Finally, the outer layer is coated with epoxy resin seal protection. Although the resistance error is higher than that of metal film, it is cheap. Carbon film resistors are still widely used in all kinds of products, is the current electronics, electrical appliances, equipment, information products, the most basic 0 components.
Metal Film Resistors
Metal film resistance (metal shooting resistance) the same use of vacuum spraying technology on the porcelain rod above, just the carbon film into a metal film (such as nickel chromium), and the metal film on the car spiral to make different resistance, and at both ends of the porcelain rod precious metals. Although it is more expensive than carbon film resistors, low noise, stability, small temperature impact, high accuracy has become its advantage. So it is widely used in advanced audio equipment, computer, instrument, defense and space equipment and so on.
Metal oxide film Resistance
Some instruments or devices need to operate over a long period of time in a high temperature environment, and the use of general resistors will not maintain their stability. In this case metal oxide film resistors (metal oxide film resistors), it is the use of high-temperature combustion technology in the heat conduction of the porcelain rod on the top of a layer of metal oxide film (such as zinc oxide), and the metal oxide film on the car spiral to make a different resistance, and then sprayed on the outer layer of non-combustible paint. It retains its stability at high temperatures, and the power of the resistive film load is also high. It also has a low noise, stable, high-frequency characteristics of the advantages of good.
Square Wire Wound resistor
Square Wire wound resistance (wire winding resistance) also known as the Cement Electric group, the use of nickel, chromium, iron and other resistance of the larger alloy resistance wire around the non-alkaline heat-resistant porcelain, outside with heat, moisture, non-corrosive material protection, and then put the wound resistor into the porcelain frame, with special non-flammable heat-resistant cement filling sealed. The difference between the non-combustible coating wire-wound resistance is only the outer coating modified by silicone or non-combustible paint. Their advantages are accurate resistance, low noise, good heat dissipation and can withstand very large power consumption, mostly used in the amplifier power level part. The disadvantage is that the resistance is small, the cost is high, also because of the presence of inductance is not suitable for high-frequency circuit use.
Carbon resistance
Carbon resistance (carbon resistor) is the use of graphite, carbon and other large resistance coefficient of the substance with a binder pressurized, heated to a rod-shaped, and in the manufacture of wire. The resistance value is determined by the proportion of the toner and the length of the carbon rod. Its manufacturing cost is the cheapest, but the stability is poor and the error is big.
SMD Resistor
SMD resistor (Chip resistor) is a form of metal glass uranium resistance, its resistance is highly reliable ruthenium series of glass uranium material is sintered at high temperature, the electrode using silver palladium alloy slurry. Characterized by small size, high precision, stability and high frequency performance, suitable for high-precision electronic products in the substrate. And the chip exclusion is a plurality of the same resistance chip resistor made into a chip resistor, the purpose is to effectively limit the number of components, reduce manufacturing costs and the size of the board.
Variable Resistors
A variable resistor, also known as a potentiometer, can arbitrarily change its resistance value in a range as needed, often for situations where it is necessary to move its joints frequently to change their resistance values, such as radios, loudspeakers, and hot water heaters. The potentiometer is usually composed of a resistor body and a movable brush, and the resistor is adjusted in such a way as to rotate, slide, insert, etc. When the brush moves along the resistor body, it obtains the resistance value or voltage which is related to the displacement at the output end. The semi-fixed resistor is a resistor that can fine-tune the resistance value, which is similar to the potentiometer is the resistance of the adjustable circuit, but its main purpose is to adjust the circuit to achieve the desired effect, the process is the technical personnel responsible, and after the adjustment will not change it.
