The three common ranges of basic 'preferred values' for components are list
in Table 2.4. The preferred values which are normally available, are multiples
of the basic values between 1 and 107, for example 4.7
, 47
, 470
, 4.7k
, 47k
,
470k
and 4.7M
(20% tolerance) resistors.
The manufacture of preferred values only is general for resistors, but less
so for capacitors, particularly above1F. By use of more than one preferred value, it is possibly to
create any desired value.
20% Tolerance | 10% Tolerance | 5% Tolerance |
10 | 10 | 10 |
- | - | 11 |
- | 12 | 12 |
- | - | 13 |
15 | 15 | 15 |
- | - | 16 |
- | 18 | 18 |
- | - | 20 |
22 | 22 | 22 |
- | - | 24 |
- | 27 | 27 |
- | - | 30 |
33 | 33 | 33 |
- | - | 36 |
- | 39 | 39 |
- | - | 43 |
47 | 47 | 47 |
- | - | 51 |
- | 56 | 56 |
- | - | 62 |
68 | 68 | 68 |
- | - | 75 |
- | 82 | 82 |
- | - | 91 |
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