Resistors should select resistors based on board size to avoid unnecessary burden on the circuit board.
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% resistanceBe 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.