| 摘要 |
PURPOSE:To simplify the constitution of an operation panel and to prevent the misoperations by securing the interlock between each variable resistor and an operation knob via a clutch and attaining the control of only the variable resistor selected by a selector switch by means of the operation knob. CONSTITUTION:The selector switches S1 and S2 interlocking with each other are set at switch contacts 1a and 2a respectively to select the sound input signals given from an input terminal 10a. The selected input signal is sent to an output terminal 16, and a variable resistor 13a is controlled by an operation knob 18 via an electromagnetic clutch 14a to obtain the proper sound volume. In this case, other variable resistors 13b-13d have no change. Then both switches S1 and S2 are successively switched to control the resistors 13b-13d in the same way. Thus the sound volume is set at a proper level for the sound signals given from input terminals 10b and 10c and the mixed signal sent from an amplifier 12. Then the switch S1 is changed over to obtain immediately the proper sound volume for each of said signals. |
