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the closest standard resistor values?
i'm solving electronic homework ,and i got the values R1=66.67
R2=12.4k
(and Rs=10 ,RL=1k are given),there is part in the question which want me to chose the closet values for the resistor before i design the circuit in pspice program.
can u tell me how i can chose from the given appendix below
Preferred resistance values (approximately 10% increase)
I1.01.52.23.34.76.8
II1.11.62.43.65.17.5
III1.21.82.73.95.68.2
IV1.32.03.04.36.29.1
I to IV for (+-)5% tolerance resistors
I and III for (+-)10% tolerance resistors
I for (+-)20% tolerance resistors
Values multiplied by 1, 10, 100, 1k, 10k, 100k, 1M, 10M
Multiplier 10 to 100k can cover all the preferred values
E.g. 11, 110, 1.1k, 11k, 110k
Resistor types: Carbon film, metal film, wirewound
i think this will be clear
I(1.0)(1.5)(2.2)(3.3)(4.7)6.8)
II(1.1)(1.6)(2.4)(3.6)(5.1)(7.5)
III(1.2)(1.8)(2.7(3.9)(5.6)(8.2)
IV(1.3)(2.0)(3.0)(4.3)(6.2)(9.1)
These are the E12 series resistors I'd chose. It is easier to recognise the values in your list if you do your formatting a bit better.
I 1.0 1.5 2.2 3.3 4.7 6.8
II 1.1 1.6 2.4 3.6 5.1 7.5
III 1.2 1.8 2.7 3.9 5.6 8.2
IV 1.3 2.0 3.0 4.3 6.2 9.1
Metal film is more common and more stable. Use wirewound if you are dumping a lot of Watts.
Group I - R1, 68Ω 10%
Group III - R2, 12kΩ 10%
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