# 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

-

Back | Index |  | Next

page (c2-1-20)
Some material Copyright RSGB.
Click here for important Copyright information
| Web Space provided by Hostroute.com Ltd
email the Project Co-ordinator