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Consumer Electronics by S. P. Bali

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INPUT SWITCHING ARRANGEMENTS

The compatibility of hi-fi units have always difficulties in operation which arises due to incorrect impedance matching and unsatisfactory signal input level. The problem of input and output impedance is much less than hitherto, thanks to standardisation between equipment manufacturers, but the problem of signal level still remains. Fig 18.1 offers a solution to this problem. Resistors R2, R3 and R4 act as variable input attenuators in conjunction with resistors R7 and R8. Where excessive signal levels are present, adjustment of the preset potentiomenters should be carried out so that the same output power and hence volume, is obtained irrespective of the type of input selected. This will avoid the volume control ...

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