| 摘要 |
PURPOSE:To decrease number of knobs for control, by giving an output from a generating source of a control signal to a plurality of control circuits to be controlled with a plurality of hold-through gates. CONSTITUTION:When a switch 7 is closed and switches 8 and 9 are opened, a hold-through gate H1 is at a through-state and other hold-through gates H2 and H3 are in a hold-state. In this case, an output voltage of a DC voltage generator 1 is applied to an impedance circuit 4 directly as a control signal and controls the transfer impedance, allowing to make tone control operation. While tone control is made, a control voltage immediately before the holding of the gates H2 and H3 is given to a sound volume controlling circuit 5 and a balance controlling circuit 6. |
