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Old 11th Sep 2019, 11:24 am   #8
Herald1360
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Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 15,158
Default Re: 2W Carbon Film Resistors

A quick calculate suggests that if you keep just 1, 2.2, 4.7 (E3) and you don't mind using up to two at a time (series or parallel), you can get the following values:


R......Use

1.......1
1.2....1+0.22
1.5....2.2||4.7
1.8....2.2||10
2.......1+1
2.2.....2.2
2.7.....2.2+0.47
3.2.....1+2.2
3.9.....4.7||22
4.7.....4.7
5.7.....1+4.7
6.9.....2.2+4.7
8.2.....10||47


Which covers E12 pretty well.

For many (most?) applications just using the nearest of 1, 2.2, 4.7 and decades will do just fine.
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Last edited by Herald1360; 11th Sep 2019 at 11:29 am.
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