Resistors are much more varies, complete specifications, large specifications, large production volume, exhibit range, appearance shape, and volume size have selected
Correctly select resistors and errors
The resistance is selected, the principle is that the nominal resistance value of the resistor used is, the smaller the resistor resistance value of the resistor required.
Error selection, the error of the resistor required for the time constant RC circuit is small as small as possible, generally within 5%; for the retractable circuit, the feedback circuit filter circuit load circuit is less than the error requirements, optional 10% -20% resistance Be aware of
Pay attention to the limit parameters of the resistor:
Rated voltage, even when the actual voltage exceeds the rated voltage, even if the power requirements are met, the resistor will be broken down;
Rated power, the rated power of the selected resistor should be greater than twice the actual tolerant power to ensure the reliability of the resistor in the long-term work of the circuit.
Selected according to circuit characteristics
High-frequency circuitry, and circuits with high quality and working stability, high reliability requirement, the smaller the distribution parameters, the better the metal film resistance or the metal oxide film resistance.
The low frequency circuit, and electronic lines with high performance requirements can be used with a winding resistor and a carbon film resistance.
Power amplifying circuit, bias circuit, sampling circuit on stability requirements, resistors having a small temperature coefficient;
The decoupling circuit, the filter circuit has no strict requirements for the resistance change, and any resistor is applied, and the resistance is selected according to the size of the board.
The principle of the electrical resistance is a high power resistor to change the small power resistor, but the electrical resistance for insurance; the metal film resistor can be changed to the carbon film resistor; the fixed resistor and the semi-adjustable resistor can be used instead of use.