| 摘要 |
PURPOSE:To prevent the shift in a level value which is preset, by applying bass and treble control signals having a half the reference voltage to a control circuit compulsively at the usage of an equalizer unit. CONSTITUTION:When a contact piece P is connected to the contact A, an equalizer unit 6 is at use, and an input signal fed from an input line is fed to the unit 6. Simultaneously, with a changing-over switch SW2, base and treble control signals are released in a control signal generating circuit 4, and a voltage dividing the reference voltage for performing each control operation by two resistors R is newly given compulsively and fed to a control circuit 1 via the changing-over switch SW2. This reference voltage changes the control signal for each operation. |
