Basic radio theory, circuits and calculations

Preferred values

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.

Table 2.4 Preferred values

  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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