| 摘要 |
PURPOSE:To facilitate operation with simple constitution by automatically switching functions by detecting the existence of power current flowing to a source group equipment and by judging the source group equipment to be selected by the detection signal. CONSTITUTION:Plugs 22-24 of record player 19, tape deck 20 and tuner21 as source group equipments are inserted into outlets 6-8 of amplifier 1. Power line 3 of this amplifier 1 is provided with detection coils 9-11 as current detection parts of respective source group equipments and detection outputs of coils 9-11 are supplied to switch part 16 via detection control part 12. This switch part 16 is applied with outputs from source equipments and under the control of control part 12, one of outputs from source equipments is automatically selected by switching part 16 and amplified by amplification part 17 before being outputted to output cord 28. Then, functions are changed over automatically by the simple constitution. |
