| 摘要 |
PURPOSE:To know previously the change of the voltage generated from a holding through gate, by supplying the voltage generated from a variable resistor to the holding-through gate after an operation of the variable resistor. CONSTITUTION:The comparators 4 and 4' produce pulses when the coincidence is obtained between the output of a variable resistor 1 and the output of the holding-through circuits 9 and 9'. Now it is supposed that the sound quality is controlled by turning a switch S7 on. In such case, the control voltage generated from the resistor 1 is different from that obtained in case when the sound quality is controlled by turning a switch S6 on. Then a switch 6 is turned on to control the sound quality. In this case, the circuit 9 is closed since a different level of voltage is applied to the comparator 4. Therefore the resistor 1 is operated to produce the pulse from the comparator 4, and the circuit 9 is opened. |
