| 摘要 |
PURPOSE:To attain the same effect with the balance adjustment of a variable resistor easily with the good sense of operaton, by increasing the decreasing a counter output any by increasing or decreasing the attenuation of each channel with the output of a counter. CONSTITUTION:The output of counter 31 is increased or decreased with UP key S1 or DOWN key S2. Then, the output of counter 31 is applied to operators 32 and 33 for each channel to generate control codes for the adjustment of the attenuation of a channel signal. Further, the control codes are applied to attenuators 34 and 35 and on the basis of the control signal, semiconductor switches are turned on-off to increase or decrease and output the channel signal. |
