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June 2023
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Standard resistor values5/31/2023 In setting the gain of an instrumentation amplifier, or the pulse width in a timing circuit, the selection of precise component values may be more critical. ![]() A designer will probably use a common 220 ohm resistor to limit current in an LED panel indicator because a little difference in brightness either way is not important. The importance of precision depends on the application. ![]() Likewise common inductors are typically only 10% precision. But capacitors (especially large electrolytics) are only guaranteed to be within 20% of their specified value. Standard resistors are only accurate to 5% or 10% but where it's critical, some can be had in 1% or better accuracy. PRECISION:It is also important to understand how precise passive components values actually are. So it's almost always better, when calculating component values for a circuit, to make the capacitor or inductor values standard, and then make the resistors be the "variable" item. ![]() Resistors DO come in a greater variety of precision values, and can be easily combined (or replaced with inexpensive potentiometers) to obtain arbitrary values. While passive electronic components like capacitors, inductors, and resistors can be manufactured to have almost any value, in practice most are produced in standard values.
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